Ivo S. Petrov; Arman Sh. Postadzhiyan; Mariya P. Tokmakova;
Lyudmila G. Kitova;
Svetlin N. Tsonev;
Janet Addison;
Reneta T. Petkova;
Vasil I. Lachev и др.
Angel M. Dzhambov; Mariya P. Tokmakova; Penka D. Gatseva;
Nikolai G. Zdravkov;
Dolina G. Gencheva;
Nevena G. Ivanova;
Krasimir I. Karastanev;
Stefka V. Vladeva;
Aleksandar T. Donchev;
Svetlan M. Dermendzhiev и др.
Angel M. Dzhambov; Mariya P. Tokmakova; Penka D. Gatseva;
Nikolai G. Zdravkov;
Dolina G. Gencheva;
Nevena G. Ivanova;
Krasimir I. Karastanev;
Stefka V. Vladeva;
Aleksandar T. Donchev;
Svetlan M. Dermendzhiev и др.
Ivo S. Petrov; Arman Sh. Postadzhiyan; Mariya P. Tokmakova;
Lyudmila G. Kitova;
Svetlin N. Tsonev;
Janet Addison;
Reneta T. Petkova;
Vasil I. Lachev и др.