потери науки In commemoration of Jury M. Rosanov (1938–2021) Authors: Borkin L. J., Litvinchuk S. N. Losses of science Svetlana Dmitrievna Vershinina (1961–2021): Her life and contribution to herpetology Authors: Borkin L. J., Vershinin V. L. Losses of Science In commemoration of Sakhat M. Shammakov (1933 – 2021) Authors: Ananjeva N. B., Rustamov E. A., Tuniev B. S., Orlov N. L., Shestopal A. A. In commemoration of Sakhat M. Shammakov