### Book Chapters

- U.B. Yusuf,
**P. Chaipunya**, P. Kumam, S. Yoo-Kong,**“Composition of quantum operations and their fixed points,”**in: Data Science for Financial Econometrics, N. Ngoc Thach et al. (Eds.), 2021, Springer, Cham, Switzerland. **P. Chaipunya**,**“Variational inequalities under the global NPC condition,”**in: New Trends in Analysis and Geometry, A.H. Alkhaldi et al. (Eds.), 2018, Cambridge Scholars Publishing, UK.- A. Padcharoen,
**P. Chaipunya**, P. Kumam,**“Existence theory in modular metric spaces,”**in: Advances in Mathematical Inequalities and Applications, P. Agarwal et al. (Eds.), 2018, Birkhäuser, Singapore. **P. Chaipunya**, P. Kumam,**“Recent fixed point techniques in fractional set-valued dynamical systems,”**in: Dynamical Systems – Analytical and Computational Techniques, M. Reyhanoglu (Ed.), 2017, InTech Publisher.

### Journal Articles

##### Accepted articles

- A.B. Abubakar, P. Kumam, M. Malik,
**P. Chaipunya**, A.H. Ibrahim,**“A hybrid FR-DY conjugate gradient algorithm for unconstrained optimization with application in portfolio selection,”**to appear in AIMS Mathematics. - P. Dechboon, P. Kumam,
**P. Chaipunya**, S. Dhompongsa,**“Fuzzy equilibrium via best proximity pairs in abstract economies,”**to appear in Soft Computing. - K. Khammahawong, P. Kumam,
**P. Chaipunya**, S. Plubtieng,**“New Tseng’s extragradient methods for Pseudomonotone Variational Inequality Problems in Hadamard Manifolds,”**to appear in Fixed Point Theory and Applications. - U. Deepan, P. Kumam,
**P. Chaipunya**,**“Sparse pinball twin parametric support vector machine,”**to appear in Thai Journal of Mathematics. - K. Khammahawong, P. Kumam,
**P. Chaipunya**,**“Splitting algorithms for equilibrium problems and inclusion problems on Hadamard manifolds,”**to appear in Numerical Functional Analysis and Optimization. - S. Termkaew, P. Kumam,
**P. Chaipunya**,**“Splitting proximal algorithms for convex optimizations over metric spaces with curvature bounded above,”**to appear in Thai Journal of Mathematics.

##### Published articles

- I. Ahmed, E.F.D. Goufo, A. Yusuf, P. Kumam,
**P. Chaipunya**, K. Nonlaopon,**“An epidemic prediction from Analysis of a combined HIV-COVID-19 co-infection model via ABC-fractional operator,”**Alexandria Engineering Journal, Vol.50 (3), 2021. - K. Khammahawong, P. Kumam,
**P. Chaipunya**,**“Splitting algorithm of common solutions between equilibrium and inclusion problems on Hadamard manifolds,”**Linear and Nonlinear Analysis, Vol.6 (2), 2020, pp.227–243. - K. Khammahawong, P. Kumam,
**P. Chaipunya**,**“On the convergence of splitting algorithm for mixed equilibrium problems on Hadamard manifolds,”**Journal of Mathematical Chemistry, Vol.58 (4), 2020, pp.799–815. - A. Padcharoen, P. Kumam,
**P. Chaipunya**, Y. Shehu,**“Convergence of inertial modified Krasnoselskii-Mann iteration with application to image recovery,”**Thai Journal of Mathematics, Vol.18 (1), 2020, pp.126–142. - N. Pakkaranang, P. Kumam, P. Cholamjiak, R. Suparatulatorn,
**P. Chaipunya**,**“Proximal point algorithms involving fixed point iteration for nonexpansive mappings in CAT() spaces,”**Carpathian Journal of Mathematics, Vol.34 (2), 2018, pp.229–237. - W. Jirakitpuwapat,
**P. Chaipunya**, P. Kumam, S. Dhompongsa, P. Thounthong,**“New methods of construction of cartesian authentication codes from geometries over finite commutative rings,”**Journal of Mathematical Cryptography, Vol.12 (3), 2018, pp.119–136.. - A. Padcharoen, P. Kumam, P. Saipara,
**P. Chaipunya**, “**Generalized Suzuki type -contraction in complete metric spaces,”**Kragujevak Journal of Mathematics, Vol.42 (2018), pp.419–430. - P. Dechboon, P. Sa Ngiamsunthorn, P. Kumam,
**P. Chaipunya**,**“Berinde-Borcut tripled best proximity points with generalized contraction pairs,”**Thai Journal of Mathematic, Vol.16 (2018), pp.287–305. - K. Wongkum, P. Kumam, Y.J. Cho, P. Thounthong,
**P. Chaipunya**,**“On the generalized Ulam-Hyers-Rassias stability for quartic functional equation in modular spaces,”**The Journal of Nonlinear Science and Applications, Vol.10 (2017), pp.1399–1406. **P. Chaipunya**, P. Kumam,**“On the proximal point method in Hadamard spaces,”**Optimization, Vol.66 (2017), Issue 10, pp.1647–1665.- P. Saipara, W. Kumam,
**P. Chaipunya**,**“Modified random errors**Statistics, Optimization, and Information Computing, Vol.5 (2017), pp.65–74.*S*-iterative process for stochastic fixed point theorems in a generalized convex metric spaces,” **P. Chaipunya**, P. Kumam,**“On some classical soft intersection properties,”**The Journal of Nonlinear Science and Applications, Vol.9 (2016), pp.5136–5142.- A. Padcharoen, D. Gopal,
**P. Chaipunya**, P. Kumam,**“Fixed point and periodic point results for -type -contractions in modular metric spaces,”**Fixed Point Theory and Applications, 2016 (1), 39. **P. Chaipunya**, P. Kumam,**“On the solvability of generalized set-valued equilibrium problems,”**Journal of Nonlinear Analysis and Optimization, 2015 (In press).**P. Chaipunya**, P. Kumam,**“Fixed point theorems for cyclic operators with application in fractional integral inclusions with delays,”**Discrete and Continuous Dynamical Systems Supplement, Dynamical Systems, Differential Equations and Applications, AIMS Procedings, 2015, pp.248–257.- P. Saipara,
**P. Chaipunya**, Y.J. Cho, P. Kumam,**“On strong and -convergence of modified**The Journal of Nonlinear Science and Applications, Vol.8 (2015), pp.965–975.*S*-iteration for total asymptotically nonexpansive mappings in CAT() spaces,” **P. Chaipunya**, P. Kumam,**“Common fixed points for an uncountable family of weakly contractive operators,”**Carpathian Journal of Mathematics, Vol.31, No.3 (2015), pp.307–312.**P. Chaipunya**, P. Kumam,**“An observation on set-valued contraction mappings in modular metric spaces,”**Thai Journal of Mathematics, Vol.13, No.1 (2015), pp.9–17.**P. Chaipunya**, P. Kumam,**“Nonself KKM maps and corresponding theorems in Hadamard manifolds,”**Applied General Topology, Vol.16, No.1 (2015), pp.37–44.- K. Wongkum,
**P. Chaipunya**, P. Kumam,**“On the generalized Ulam-Hyers-Rassias stability of quadratic mappings in modular spaces without conditions,”**Journal of Function Spaces, Vol.2015, Article ID 461719, 2015. **P. Chaipunya**, Y.J. Cho, P. Kumam,**“A remark on the property and periodic points of order in cone metric spaces,”**Mathematiči Vesnik, 66, 4 (2014), pp.357–363.**P. Chaipunya**, Y.J. Cho, P. Kumam,**“On circular metric spaces and common fixed points for an infinite family of set-valued operators,”**Vietnam Journal of Mathematics, June 2014, Vol.42, Issue 2, pp.205–218.**P. Chaipunya**, P. Kumam,**“On the distance between three arbitrary points,”**Journal of Function Spaces and Applications, vol. 2013, Article ID 194631, 7 pages, 2013.**P. Chaipunya**, P. Kumam,**“Topological aspects of circular metric spaces and some observations on the KKM property towards quasi-equilibrium problems,”**Journal of Inequalities and Applications, 2013, 2013:343.- K. Wongkum,
**P. Chaipunya**, P. Kumam,**“Some analogies of the Banach contraction principle in fuzzy modular spaces,”**The Scientific World Journal, vol. 2013, Article ID 205275, 4 pages, 2013. **P. Chaipunya**, W. Sintunavarat, P. Kumam,**“On -contractions in ordered metric spaces,”**Fixed Point Theory and Applications, 2012, 2012:219.**P. Chaipunya**, Y.J. Cho, P. Kumam,**“Geraghty-type theorems in modular metric spaces with an application to partial differential equation,”**Advances in Difference Equations, 2012, 2012:83.**P. Chaipunya**, C. Mongkolkeha, W. Sintunavarat, P. Kumam,**“Fixed point theorems for multivalued mappings in modular metric spaces,”**Abstract and Applied Analysis, vol. 2012, Article ID 503504, 14 pages, 2012.