3.  P. Muthukumar and C. Rajivganthi, Approximate controllability of second-order neutral stochastic differential equations with infinite delay and Poisson jumps, Journal of Systems Science & Complexity, October 2015, Volume 28, Issue 5, pp 1033-1048 DOI: 10.1007/ s11424 -015-3075-7

2. C. Rajivganthi, K. Thiagu, P. Muthukumar and P. Balasubramaniam, Existence of solutions and approximate controllability of impulsive fractional stochastic differential systems with infinite delay and Poisson jumps, Applications of Mathematics, Vol. 60, No. 4, pp. 395-419, 2015. DOI: 10.1007/s10492-015-0103-9 

1. Muthukumar Palanisamy, Hamidreza Modares, Frank Lewis and Muhammad Aurangzeb, Continuous-time Q-learning for Infinite-horizon Discounted Cost Linear Quadratic Regulator Problems,  IEEE Transactions on Cybernetics, Vol.45, Iss 2, pp.165-176 , 2015,  doi:  10.1109/ TCYB. 2014.2322116.

1.   B. Ganesh Priya and P. Muthukumar, Approximate solution for time-delay fractional Fishers's equation by shifted Jacobi - Gauss collocation method, Mathematical Sciences International Research Journal (ISSN : 2278-8697), Vol.4, Iss.2(2015), pp.104-108.