Sukma, Y., and N. Priatna. “MATHEMATICS TEACHERS’ RESPONSE TO ONLINE LEARNING DURING THE COVID-19 PANDEMIC: CHALLENGES AND OPPORTUNITIES”. Kalamatika: Jurnal Pendidikan Matematika, Vol. 6, no. 1, Apr. 2021, pp. 1-14, doi:10.22236/KALAMATIKA.vol6no1.2021pp1-14.