Antala, B.     The impact of coeducational physical education to the class climate at secondary schools [Текст] / B. Antala, V. Dancikova // Olympic Sports and Sport for All. Sport, Stress, Adaptation : proceeding book of XVI International Scientific Congress and VI International Scientific Congress (17-19 May 2012 ) : extra issue of Sport and science / ed. staff: P. Gashev, D. Dasheva, S. Videnova ; National Sport Academy "Vassil Leski". — Sofia, 2012. — P. 167-169.