PYROZHENKO, Lidiya. ELECTIVE COURSES AS A COMPONENT OF EDUCATION DIFFERENTIATION IN 60-80-S OF THE XX CENTURY. Ukrainian Educational Journal, [S. l.], n. 3, p. 198–208, 2015. Disponível em: https://uej.undip.org.ua/index.php/journal/article/view/102. Acesso em: 13 nov. 2026.