Karsim, K., Suyitno, H. and Isnarto, I. (2017) “Influence of IQ and mathematical disposition toward the problem solving ability of learners grade VII through PBL learning model with the assistance LKPD”, *Unnes Journal of Mathematics Education*, 6(3), pp. 352-359. doi: 10.15294/ujme.v6i3.16936.