Bratoy Koprinarov
Pages: 1-6
Nina M. Musurlieva
Pages: 13-18
Nina M. Musurlieva
Pages: 39-47
Stanislav Plyakov
Pages: 7-12
Братой Копринаров
Pages: 19-38
NATURAL AND TECHNICAL SCIENCES SECTION
Penka N. Zlateva, Rositsa V. Petkova-Slipets and Zdravko N. Petrov
Pages: 48-55