ติ๊กจ๊ะ ว., หน่อใหม่ ฐ., จิตต์บุรุษ อ., & ภูมิลา อ. (2018). PERIODIC WITH PERIOD 4 OF A PIECEWISE LINEAR SYSTEM OF DIFFERENCE EQUATIONS WITH INITIAL CONDITIONS BEING SOME POINTS ON POSITIVE Y AXIS. PSRU Journal of Science and Technology, 3(2), 26–34. Retrieved from https://ph01.tci-thaijo.org/index.php/Scipsru/article/view/125217