Иво Ангелов Христов
Pages: 1-16
Bratoy Koprinarov
Pages: 24-33
Teodora Hristova
Pages: 44-61
Elena S. Petkova
Pages: 17-23
Bratoy Koprinarov, Stoyan Marinov and Galina Ilieva
Pages: 34-43
NATURAL AND TECHNICAL SCIENCES SECTION
Angel St. Marinov
Pages: 61-67
Diyan M. Dimitrov, Janka P. Krasteva and Georgi Georgiev
Pages: 68-74