Leroy A. Flores and Levi Elipane. Use of Lesson Study as a Tool to Develop an Improved Instructional Design in Teaching Integration by Parts in Calculus. LLERU-V5 [Internet]. 2025 May 14 [cited 2026 Jul. 28];:86-99. Available from: https://stm.bookpi.org/LLERU-V5/article/view/18204