The domestication of the horse (principal solution of the problem) - Dergačëv, Valentin Anisimovič (Tracii şi lumea circumpontică. Congresul al IX-lea Internaţional de Tracologie. Thracians and circumpontic World. IX-th International Congress of Thracology. (Chişinău - Vadul lui Vodă, 6-11 sept. 2004.) Rezumate - Summaries., 2004)