Nosrat, Azizollah, and Abdulhamid Parsafar. “Effect of Problem-Solving Based Methods on Critical Thinking and Academic Achievement of Math Among Students of Saravan Higher Education Centers”. International Journal of Applied Mathematical Research, vol. 7, no. 1, Dec. 2017, pp. 1-6, https://doi.org/10.14419/ijamr.v7i1.8397.