Korolija, Jasminka N, Snežana Rajić, Milena Tošić, and Ljuba M Mandić. 2015. “"It Happened, Whats the Problem?" and ‘A Guide through the Problem’ - A Model for Consideration of Ecological Issues in Chemistry Education”. Journal of the Serbian Chemical Society 80 (12). Belgrade, Serbia:1567-80. https://doi.org/10.2298/JSC150522072K.