Ratibenyakool Y, Masiri A, Ngamkhiew T, Rerkruthairat N. The even door problem. Asia Pac J Sci Technol [internet]. 2017 Sep. 30 [cited 2025 Apr. 11];22(3):APST-22. available from: https://so01.tci-thaijo.org/index.php/APST/article/view/101487