Chueamang P, Piasai K, Hajisalah S, Chaladgarn T, Janjaroon A. A STUDY OF MATHAYOMSUKSA II STUDENTS’PROOF ABILITIES ON PARALLEL VIA CONJECTURING AND PROVING APPROACH WITH GEOGEBRA PROGRAM. J. IND. EDUC. [Internet]. 2020 Sep. 14 [cited 2024 May 3];19(2):40-9. Available from: https://ph01.tci-thaijo.org/index.php/JIE/article/view/240570