Citation Rankings (Highly Cited Researchers) and the list of the most cited and influential researchers cover a wide range of scientific fields, spanning 197 main and sub-disciplines, as well as the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings, offering a unique service. Additionally, the list without CERN, Statistical Data, etc., provided exclusively by “AD Scientific Index”, is part of our effort to balance the situation created by CERN and researchers with statistical data, who have an advantage over others, especially those in the social and humanities fields. There should be new regulations for multi-author and CERN papers. Citation lists also reveal many rule violations and unethical practices. See also for more specific citation analyses: Scientists Last 6 years Citation Index, Universities Total Citations Rankings 2025 and Universities Last 6 Years Citations Rankings 2025
* Total Citation Counts Rankings
Ranking Based On Selection :1
Functional Analysis
Operator Theory
Linear Topological Invariants
Fixed Point Theory
Best
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,883
12,326
0.590
* Total Citation Counts Rankings
Ranking Based On Selection :2
Fractional calculus
Painleve analysis
Fractional differential equations
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,594
9,441
0.891
* Total Citation Counts Rankings
Ranking Based On Selection :3
Mathematics
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,130
505
0.237
* Total Citation Counts Rankings
Ranking Based On Selection :4
Operator theory
Spectral analysis
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,095
803
0.733
* Total Citation Counts Rankings
Ranking Based On Selection :5
Approximation Theory
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
666
191
0.287
* Total Citation Counts Rankings
Ranking Based On Selection :6
Applied Mathematics
Mathematical Physics
Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
45
45
1.000
Erdal Karapınar
Atılım University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
20,883
12,326
0.590
Functional Analysis
Operator Theory
Linear Topological Invariants
Fixed Point Theory
Best
Fahd Jarad
Çankaya University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
10,594
9,441
0.891
Fractional calculus
Painleve analysis
Fractional differential equations
Billur Kaymakçalan
Çankaya University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,130
505
0.237
Ekin Uğurlu
Çankaya University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,095
803
0.733
Operator theory
Spectral analysis
Alexander Kushpel
Çankaya University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
666
191
0.287
Taylan Demir
Çankaya University
Ankara, Türkiye
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
45
45
1.000
Applied Mathematics
Mathematical Physics
Engineering