1.
Nurhidayah N, Waskitoningtyas RS. Implementation of problem-based learning models to improve understanding of mathematics concepts at Al-Hassan high school. J. Math Educ. Nusant. Wahana Publ. Karya Tulis Ilm. di Bid. Pendidik. Mat. 2023;9(1):76-88. doi:10.29407/jmen.v9i1.19544