2. P. Muthukumar and C. Rajivganthi, Approximate controllability of fractional neutral stochastic integro-differential system with non-local conditions and infinite delay, Taiwanese Journal of Mathematics, vol.17, no.5, 2013, pp.1693–1713, doi: 10.11650/tjm.17.2013.2743

1. P. Muthukumar and C. Rajivganthi, Approximate controllability of impulsive neutral stochastic functional differential system with state-dependent delay in Hilbert spaces, Journal of Control Theory and Applications, vol.11, no.3, 2013,  pp.351–358, doi:10.1007/s11768-013-2061-7