Arnawa IM, sumarno U, Kartasasmita B, Baskoro ET. APPLYING THE APOS THEORY TO IMPROVE STUDENTS ABILITY TO PROVE IN ELEMENTARY ABSTRACT ALGEBRA. JIMS [Internet]. 2012 Jul. 24 [cited 2025 Jan. 30];13(1):133-48. Available from: https://jims-a.org./index.php/jimsa/article/view/80