Atanas Terziyski
University of Plovdiv
Tel: +359 888-717141
Fax: +359 32 635049
E-mail:

Victor Ivanov
University of Plovdiv
Tel: +359 889-448761
E-mail:

University of Plovdiv
Tsar Assen 24, Str
4000 Plovdiv
BULGARIA