Tijjani Umar

540 total citations
18 papers, 408 citations indexed

About

Tijjani Umar is a scholar working on Molecular Biology, Surgery and Oncology. According to data from OpenAlex, Tijjani Umar has authored 18 papers receiving a total of 408 indexed citations (citations by other indexed papers that have themselves been cited), including 8 papers in Molecular Biology, 6 papers in Surgery and 6 papers in Oncology. Recurrent topics in Tijjani Umar's work include Nitric Oxide and Endothelin Effects (5 papers), Ear and Head Tumors (5 papers) and Salivary Gland Tumors Diagnosis and Treatment (5 papers). Tijjani Umar is often cited by papers focused on Nitric Oxide and Endothelin Effects (5 papers), Ear and Head Tumors (5 papers) and Salivary Gland Tumors Diagnosis and Treatment (5 papers). Tijjani Umar collaborates with scholars based in United Kingdom and Russia. Tijjani Umar's co-authors include Peter A. Brennan, A. Wilson, C.A. Pratt, Constantinos Mourouzis, John Langdon, Anne V. Spedding, M. Ethunandan, G.A. Zaki, T.K. Mellor and Manish Patel and has published in prestigious journals such as Journal of Oral and Maxillofacial Surgery, International Journal of Oral and Maxillofacial Surgery and Journal of Oral Pathology and Medicine.

In The Last Decade

Tijjani Umar

18 papers receiving 402 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Tijjani Umar United Kingdom	12	152	144	137	91	81	18	408
Yousef Binamer Saudi Arabia	12	126 0.8×	44 0.3×	49 0.4×	96 1.1×	22 0.3×	43	336
W. R. Green United States	13	42 0.3×	71 0.5×	60 0.4×	150 1.6×	34 0.4×	15	564
Joël Cucherousset France	9	13 0.1×	112 0.8×	105 0.8×	39 0.4×	90 1.1×	13	284
Firas Al‐Qarqaz Jordan	12	215 1.4×	77 0.5×	39 0.3×	88 1.0×	22 0.3×	43	403
Kenneth Ngo United States	10	124 0.8×	122 0.8×	140 1.0×	140 1.5×	29 0.4×	16	458
Zaixing Wang China	8	64 0.4×	25 0.2×	37 0.3×	89 1.0×	20 0.2×	26	312
Kavita Goyal India	10	133 0.9×	82 0.6×	44 0.3×	52 0.6×	15 0.2×	55	273
KC Moon South Korea	11	104 0.7×	37 0.3×	45 0.3×	185 2.0×	48 0.6×	19	409
Robert N. Page United States	9	114 0.8×	68 0.5×	120 0.9×	56 0.6×	15 0.2×	16	257
Hilda E. Ramón United States	8	221 1.5×	53 0.4×	103 0.8×	89 1.0×	36 0.4×	9	651

Countries citing papers authored by Tijjani Umar

Since Specialization

Citations

This map shows the geographic impact of Tijjani Umar's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Tijjani Umar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Tijjani Umar more than expected).

Fields of papers citing papers by Tijjani Umar

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Tijjani Umar. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Tijjani Umar. The network helps show where Tijjani Umar may publish in the future.

Co-authorship network of co-authors of Tijjani Umar

This figure shows the co-authorship network connecting the top 25 collaborators of Tijjani Umar. A scholar is included among the top collaborators of Tijjani Umar based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Tijjani Umar. Tijjani Umar is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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18 of 18 papers shown

O’Connor, N., et al.. (2010). Head and neck pilomatricoma: an analysis of 201 cases. British Journal of Oral and Maxillofacial Surgery. 49(5). 354–358. 38 indexed citations

Mourouzis, Constantinos, et al.. (2009). Cutaneous head and neck SCCs and risk of nodal metastasis – UK experience. Journal of Cranio-Maxillofacial Surgery. 37(8). 443–447. 128 indexed citations

Ethunandan, M., et al.. (2008). Factors influencing the occurrence of multicentric and ‘recurrent’ Warthin's tumour: a cross sectional study. International Journal of Oral and Maxillofacial Surgery. 37(9). 831–834. 9 indexed citations

Ethunandan, M., et al.. (2006). Lipomatous Lesions of the Parotid Gland. Journal of Oral and Maxillofacial Surgery. 64(11). 1583–1586. 17 indexed citations

Umar, Tijjani, et al.. (2004). Pseudoporfiria en paciente dializada. Actas Dermo-Sifiliográficas. 95(8). 522–524. 2 indexed citations

Downie, Ian, et al.. (2004). Does administration of isosorbide mononitrate affect cellular proliferation in oral squamous cell carcinoma? A prospective randomized clinical study. Journal of Oral and Maxillofacial Surgery. 62(9). 1064–1068. 8 indexed citations

Umar, Tijjani, et al.. (2003). Expression of inducible nitric oxide synthase in cutaneous adnexal tumours of the head and neck. International Journal of Oral and Maxillofacial Surgery. 32(5). 534–538. 3 indexed citations

Brennan, Peter A., et al.. (2002). Expression of nitric oxide synthase-2 in cutaneous squamous cell carcinoma of the head and neck. British Journal of Oral and Maxillofacial Surgery. 40(3). 191–194. 14 indexed citations

Brennan, Peter A., et al.. (2002). Expression of type 2 nitric oxide synthase and p21 in oral squamous cell carcinoma. International Journal of Oral and Maxillofacial Surgery. 31(2). 200–205. 16 indexed citations

10.

Brennan, Peter A., et al.. (2002). Expression of vascular endothelial growth factor in basal cell carcinoma and cutaneous squamous cell carcinoma of the head and neck. Journal of Cutaneous Pathology. 29(10). 585–589. 47 indexed citations

11.

Brennan, Peter A., et al.. (2002). Expression of type 2 nitric oxide synthase and vascular endothelial growth factor in oral dysplasia. Journal of Oral and Maxillofacial Surgery. 60(12). 1455–1460. 22 indexed citations

12.

Brennan, Peter A., et al.. (2002). Expression of type 2 nitric oxide synthase and p53 in Warthin's tumour of the parotid. Journal of Oral Pathology and Medicine. 31(8). 458–462. 5 indexed citations

13.

Brennan, Peter A., et al.. (2000). Expression of nitric oxide synthase in pleomorphic adenomas of the parotid. British Journal of Oral and Maxillofacial Surgery. 38(4). 338–342. 21 indexed citations

14.

Umar, Tijjani, et al.. (2000). Carcinoma arising in a tailgut cyst diagnosed on fine needle aspiration (FNA) cytology. Cytopathology. 11(2). 129–132. 13 indexed citations

15.

Brennan, Peter A., Tijjani Umar, G.A. Zaki, et al.. (2000). Are myoepithelial cells responsible for the widespread expression of inducible nitric oxide synthase in pleomorphic adenoma? An immunohistochemical study. Journal of Oral Pathology and Medicine. 29(6). 279–283. 22 indexed citations

16.

Brennan, Peter A., et al.. (2000). Nitric oxide synthase expression is downregulated in basal cell carcinoma of the head and neck. British Journal of Oral and Maxillofacial Surgery. 38(6). 633–636. 11 indexed citations

17.

Brennan, Peter A., Tijjani Umar, Miriam Palacios‐Callender, et al.. (2000). A study to assess inducible nitric oxide synthase expression in oral lichen planus. Journal of Oral Pathology and Medicine. 29(6). 249–254. 15 indexed citations

18.

Brennan, Peter A., Miriam Palacios‐Callender, Tijjani Umar, et al.. (2000). Correlation between type II nitric oxide synthase and p53 expression in oral squamous cell carcinoma. British Journal of Oral and Maxillofacial Surgery. 38(6). 627–632. 17 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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