Ludmila Yordanova Nikolova
Professor, PhD
E-mail: ludmilan@fmi.uni-sofia.bg
Milko Damianov Takev
Associated professor, PhD
E-mail: babev@fmi.uni-sofia.bg
Vladimir Dimitrov Babev
Associated professor, PhD
E-mail: babev@fmi.uni-sofia.bg
Vladimir Atanasov Popov
E-mail: popov@fmi.uni-sofia.bg