Horvat, Saša, Mirjana D. Segedinac, Dušica D. Milenković, and Tamara N. Hrin. 2016. “Development of Procedure for the Assessment of Cognitive Complexity of Stoichiometric Tasks”. Macedonian Journal of Chemistry and Chemical Engineering 35 (2):275-84. https://doi.org/10.20450/mjcce.2016.893.