Kaldjärv, M. (2009). LOGICAL ARGUMENTATION ON THE BASIS OF STATE EXAMINATION COMPOSITIONS. Problems of Education in the 21st Century , Problems of Education in the 21st Century , 10. presented at the January/2009. Retrieved from http://oaji.net/articles/2014/457-1392315326.pdf

Aurah, C. M., Koloi-Keaikitse, S., Isaacs, C., & Finch, H. (2011). THE ROLE OF METACOGNITION IN EVERYDAY PROBLEM SOLVING AMONG PRIMARY STUDENTS IN KENYA. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 30. presented at the May/2011. doi:https://doi.org/10.33225/pec/11.30.09

Temel, S. (2013). PROSPECTIVE CHEMISTRY TEACHERS’ PROBLEM SOLVING ACHIEVEMENT ACCORDING TO THEIR LEVELS OF METACOGNITIVE SKILLS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 51. presented at the March/2013. doi:https://doi.org/10.33225/pec/13.51.126

Nizaruddin,, Muhtarom,, & Murtianto, Y. H. (2017). EXPLORING OF MULTI MATHEMATICAL REPRESENTATION CAPABILITY IN PROBLEM SOLVING ON SENIOR HIGH SCHOOL STUDENTS. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 75(6), Continuous. presented at the December/2017. doi:https://doi.org/10.33225/pec/17.75.591

Friyatmi,, Mardapi, D., & Haryanto,. (2020). ASSESSING STUDENTS’ HIGHER ORDER THINKING SKILLS USING MULTIDIMENSIONAL ITEM RESPONSE THEORY. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 78(2), Continuous. presented at the April/2020. doi:https://doi.org/10.33225/pec/20.78.196

Ersoy, M., & Dağyar, M. (2022). A MATHEMATICAL PROBLEM-SOLVING PERCEPTION SCALE FOR SECONDARY SCHOOL STUDENTS: A VALIDITY AND RELIABILITY STUDY. Problems of Education in the 21st Century, Problems of Education in the 21st Century, 80(5), Continuous. presented at the October/2022. doi:https://doi.org/10.33225/pec/22.80.693