Simanungkalit, Rick Hunter, and Renita Br Peranginangin. “Analysis of Mathematics Problem Solving Ability of Junior High School Students in Solving Problems in Online Learning”. Phenomenon : Jurnal Pendidikan MIPA, vol. 11, no. 2, Dec. 2021, pp. 127-44, doi:10.21580/phen.2021.11.2.8816.