Biblio
2000
Bonchev, E., V.N. Sholpo, N.V. Shebalin, S. Rizhikova, V. Kostadinov, G.J. Reisner, V. Kostadinov, J. Karagyuleva, I. Bune, and Ludmil Christoskov. "
A Method for Compilation of Seismic Zoning Prognostic Maps for the Territory of Bulgaria."
Geologica Balcanica 12, no. 2 (2000): 3=48.