Xenodochidis A. Charilaos; Raina G. Ardasheva; Veselin G. Popov;
Natalia A. Prissadova;
Valentin I. Turiyski;
Athanas D. Krustev;
Mariya I. Vlaykova;
Zhanet G. Grudeva-Popova;
Marieta V. Sopadzhieva и др.
Ivana Uhrikova; Milan Sepsi; Jana Hlozkova;
Pavel Suchy;
Marta Kasajova;
Katerina Machackova;
Delian P. Delev;
Rachele Ciccocioppo;
Peter Kruzliak;
Peter Scheer и др.