Hristo Avgustov Kabaktchiev
Professor, DSc
E-mail: ckabakchiev@fmi.uni-sofia.bg
Alexander Todorov Grigorov
Associate professor, PhD
E-mail: alexander.grigorov@fmi.uni-sofia.bg
Petko Ruskov Ruskov
Associate professor, PhD
E-mail: petkor@fmi.uni-sofia.bg