|
Universidad Complutense de Madrid
|
University
|
Spain |
21
|
|
Kent State University
|
University
|
United States |
6
|
|
Universidad de Valladolid
|
University
|
Spain |
5
|
|
Universidade Federal da Paraíba
|
University
|
Brazil |
3
|
|
Universidad Politécnica de Valencia
|
University
|
Spain |
2
|
|
Universidad de Sevilla
|
University
|
Spain |
2
|
|
Instituto de Ciencias Matemáticas
|
Research Centre
|
Spain |
2
|
|
University of Zanjan
|
University
|
Iran |
2
|
|
Universidade Federal de Campina Grande
|
University
|
Brazil |
2
|
|
University of Pennsylvania
|
University
|
United States |
1
|
|
West Virginia University
|
University
|
United States |
1
|
|
Universidade Federal de Pernambuco
|
University
|
Brazil |
1
|
|
Baden-Wuerttemberg Cooperative State University
|
University
|
Germany |
1
|
