Aini, S.D. et al. 2020. WRITTEN MATHEMATICAL COMMUNICATION SKILLS ON OPEN-ENDED PROBLEMS: IS IT DIFFERENT BASED ON THE LEVEL OF MATHEMATICS ABILITY?. MaPan : Jurnal Matematika dan Pembelajaran. 8, 2 (Dec. 2020), 179–204. DOI:https://doi.org/10.24252/mapan.2020v8n2a2.