Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies
if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the
same subfield and year (this is the minimum needed to enter the top 1%, not the average
within it), or reaches the top citation threshold in at least one of its specific research
topics.
Asymmetric Synthesis Catalyzed by Chiral Ferrocenylphosphine–Transition Metal Complexes. I. Preparation of Chiral Ferrocenylphosphines
Countries citing papers authored by Keiji Yamamoto
Since
Specialization
Citations
This map shows the geographic impact of Keiji Yamamoto'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 Keiji Yamamoto with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Keiji Yamamoto more than expected).
This network shows the impact of papers produced by Keiji Yamamoto. 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 Keiji Yamamoto. The network helps show where Keiji Yamamoto may publish in the future.
Co-authorship network of co-authors of Keiji Yamamoto
This figure shows the co-authorship network connecting the top 25 collaborators of Keiji Yamamoto.
A scholar is included among the top collaborators of Keiji Yamamoto 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 Keiji Yamamoto. Keiji Yamamoto is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Yamamoto, Keiji, et al.. (2001). Controlled Release of Nifedipine from Coevaporates Prepared with Eudragit and Poloxamer. 61(1). 21–33.2 indexed citations
10.
Ito, Shusei, et al.. (2000). Characterization of Chloramphenicol Palmitate Form C and Absorption Assessments of Chloramphenicol Palmitate Polymorphs. 60(1). 43–52.1 indexed citations
11.
Oguchi, Toshio, et al.. (2000). Fast Release and Physicochemical Characteristics of Nifedipine Solid Dispersions with Poloxamers. 60(1). 77–87.1 indexed citations
12.
Satomi, Eriko, Akira Kaneko, Y Nishimura, et al.. (2000). EFFECT OF ENDOSCOPIC TREATMENT OF GASTRIC ANTRAL VASCULAR ECTASIA ASSOCIATED WITH CHRONIC LIVER DISEASE. Digestive Endoscopy. 12(1). 25–28.2 indexed citations
13.
Tozuka, Yuichi, et al.. (2000). Evaluation of Physicochemical Stability of Amorphous Cefditoren Pivoxil, Using Modulated-Temperature Differential Scanning Calorimetry. 60(2). 160–165.1 indexed citations
14.
Ishida, Takao, Tomoko Ishikawa, Y. Mitsui, et al.. (1999). Analyses on Monolithic InP HEMT Resistive Mixer Operating under Very Low LO Power. IEICE Transactions on Electronics. 82(10). 1831–1838.1 indexed citations
Oguchi, Toshio, Yuichi Tozuka, Siriporn Okonogi, Etsuo Yonemochi, & Keiji Yamamoto. (1997). Improved Dissolution of Naproxen from Solid Dispersions with Porous Additives. 57(3). 168–173.6 indexed citations
17.
Yamamoto, Keiji, et al.. (1989). Determination of Solubility Parameters for Solid Medicinals and Excipients. Journal of Pharmacobio-Dynamics. 12(2).3 indexed citations
18.
Terada, Katsuhide, et al.. (1986). Study of freeze-drying in drug-additive binary system. Journal of Pharmacobio-Dynamics. 9(5).1 indexed citations
19.
Nakai, Yoshinobu, Keiji Yamamoto, Katsuhide Terada, & Takeshi Uchida. (1984). POLYMORPHISM OF TEGAFUR. Journal of Pharmacobio-Dynamics. 7(2).1 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.