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ติ๊กจ๊ะ ว, หน่อใหม่ ฐ, จิตต์บุรุษ อ, ภูมิลา อ. PERIODIC WITH PERIOD 4 OF A PIECEWISE LINEAR SYSTEM OF DIFFERENCE EQUATIONS WITH INITIAL CONDITIONS BEING SOME POINTS ON POSITIVE Y AXIS. PSRU J. Sci. Tech. [Internet]. 2018 Aug. 29 [cited 2022 Aug. 13];3(2):26-34. Available from: https://ph01.tci-thaijo.org/index.php/Scipsru/article/view/125217