1 (1869) | Bulgarian Academy of Sciences * | BGR | ||
2 (2735) | Sofia University | BGR | ||
3 (3342) | Institute of Mathematics and Informatics Bulgarian Academy of Sciences | BGR | ||
4 (3386) | South West University Neofit Rilski | BGR | ||
5 (3567) | University of Plovdiv Paisii Hilendarski | BGR | ||