28.	Teerapol Sukhonwimolmal, Paisan Nakmahahchalasint, Patanee Udomkavanich, Stability of Fréchet's functional equation on certain groupoids, ScienceAsia, Vol. 42, No. 4 (2016), 296-301.
27.	C. Srisawat, N. Kitisin and P. Nakmahachalasint, On an alternative functional equation related to the Jensen's functional equation, East-West Journal of Mathematics, Vol. 17, No. 2 (2015), 185-193.
26.	Jenjira Tipyan, Patanee Udomkavanich and Paisan Nakmahachalasint, An alternative quadratic functional equation on 2-divisible abelian groups, to appear in Thai Journal of Mathematics.
25.	Choodech Srisawat, Nataphan Kitisin and Paisan Nakmahachalasint, An alternative functional equation of Jensen type on groups, ScienceAsia, Vol. 41, No. 4 (2015), 280-288.
24.	Paisan Nakmahachalasint, An alternative quadratic functional equation on 2-divisible groups, ScienceAsia, Vol. 41, No. 2 (2015), 136-140.
23.	Jenjira Tipyan, Choodech Srisawat, Patanee Udomkavanich and Paisan Nakmahachalasint, The generalized stability of an n-dimensional Jensen type functional equation, Thai Journal of Mathematics, Vol. 12, No. 2 (2014), 265-274 .
22.	Paisan Nakmahachalasint, Stability of an alternative quadratic functional equation, Mathematical Inequalities & Applications, Vol. 17, No. 1 (2014), 179-185.
21.	Paisan Nakmahachalasint, Stability of an alternative Jensen's functional equation, ScienceAsia, Vol. 39, No. 6 (2013), 643-648.
20.	Paisan Nakmahachalasint, An alternative Jensen's functional equation on semigroups, ScienceAsia, Vol. 38, No. 4 (2012), 408-413.
19.	Tippaporn Eungrasamee, Patanee Udomkavanich and Paisan Nakmahachalasint, Generalized stability of classical polynomial functional equation of order n, Advances in Difference Equations, 2012.
18.	T. Sukhonwimolmal, P. Udomkavanich and P. Nakmahachalasint, Functional Equation Analogous to the 2-Dimensional Wave Equation, Chamchuri Journal of Mathematics, Vol. 4 (2012), 1-11.
17.	Wanchitra Towanlong and Paisan Nakmahachalasint, Fréchet functional equations with restricted spans: Solution on real numbers, ScienceAsia, Vol. 37, No. 2 (2011), 125-129.
16.	Wanchitra Towanlong and Paisan Nakmahachalasint, A Mixed-Type Quadratic and Cubic Functional Equation and Its Stability, Thai Journal of Mathematics, Vol. 8, No. 4 (2010), 61-71.
15.	T. Eungrasamee, P. Udomkavanich and P. Nakmahachalasint, An n-dimensional mixed-type additive and quadratic functional equation and its stability, Thai Journal of Mathematics, Vol. 8, No. 4 (2010), 43-50.
14.	Wanchitra Towanlong and Paisan Nakmahachalasint, An n-dimensional mixed-type additive and quadratic functional equation and its stability, ScienceAsia, Vol. 35, No. 4 (2009), 381-385.
13.	Wanchitra Towanlong and Paisan Nakmahachalasint, A quadratic functional equation and its generalized Hyers-Ulam Rassias stability, Thai Journal of Mathematics, Vol. 6, No. 3 (2008), 85-91.
12.	Montakarn Petapirak and Paisan Nakmahachalasint, A quartic functional equation and its generalized Hyers-Ulam-Rassias stability, Thai Journal of Mathematics, Vol. 6, No. 3 (2008), 77-84 .
11.	Araya Wiwatwanich and Paisan Nakmahachalasint, On the Stability of a Cubic Functional Equation, Thai Journal of Mathematics, Vol. 6, No. 3 (2008), 69-76 .
10.	Chao Kusollerschariya and Paisan Nakmahachalasint, The Stability of the Pexiderized Cosine Functional Equation, Thai Journal of Mathematics, Vol. 6, No. 3 (2008), 39-44 .
9.	Paisan Nakmahachalasint, On the stability of a mixed-type linear and quadratic functional equation, Bulletin of the Australian  Mathematical Society, Vol. 77, Issue 1 (2008), 167-176.
8.	Paisan Nakmahachalasint, On the Hyers-Ulam-Rassias stability of an n-dimensional additive functional equation, Thai Journal of Mathematics, Vol. 5, No.3 (2007), 81-86 .
7.	Paisan Nakmahachalasint, Limit of rational function at an isolated singularity, Journal of Scientific Research, Vol. 32, No. 2 (2007), 117-121.
6.	Paisan Nakmahachalasint, Hyers-Ulam-Rassias and Ulam-Gavruta-Rassias stabilities of an additive functional equation in several variables, International Journal of Mathematics and Mathematical Sciences, Volume 2007, Article ID 13437, 6 pages.
5.	Paisan Nakmahachalasint, The stability of a cosine functional equation, KMITL Science Journal, Vol. 7, No. 1 (2007), 49-53.
4.	Paisan Nakmahachalasint, On the generalized Ulam-Gavruta-Rassias stability of mixed type linear and Euler-Lagrange-Rassias functional equations, International Journal of Mathematics and Mathematical Sciences, Volume 2007, Article ID 63239, 10 pages.
3.	Paisan Nakmahachalasint, The generalized Hyers-Ulam-Rassias stability of a quadratic functional equation, Thai Journal of Mathematics, Volume 4, No 2 (2006), 321 - 328.
2.	P. Nakmahachalasint and P. Sawangtong, Complete Blow-up of a Semilinear Parabolic Equation, Thai Journal of Mathematics, Vol. 1, No. 1 (2003), 79-89.
1.	J. Rudnick, P. Nakmahachalasint, and G. Gaspari, Cluster Distribution in Mean-Field Percolation: Scaling and Universality, Physical Review E58 (1998), 5596-5601.