E. Meel D. MODELS AND THEORIES OF THE MATHEMATICAL UNDERSTANDING: COMPARING PIRIE AND KIEREN’S MODEL OF THE GROWTH OF MATHEMATICAL UNDERSTANDING AND APOS THEORY. RELIME [Internet]. 2003 Nov. 30 [cited 2026 Aug. 28];6(3):221-78. Available from: https://www.relime.org/index.php/relime/article/view/546