Purwati, L., Rochmad, R. and Wuryanto, W. 2018. An analysis of mathematical problem solving ability based on hard work character in mathematics learning using connecting organizing reflecting extending model. Unnes Journal of Mathematics Education. 7, 3 (Nov. 2018), 195-202. DOI:https://doi.org/10.15294/ujme.v7i3.28977.