1. AGGARWAL, N.N. “Behaviour of a complex intermittent system with waiting time”, Jour of Royal Naval Scientific Service, Vol. 19, No. 3, May 1964.
2. PRAKASH, SURYA, KUMAR, SANTOSH, GARG, R.C. and AGGARWAL, S.P. “On the Stochastic Behaviour of an Intermittent System with Stand-by Redundancy” to appear in Trabajos de Estadistica y de Investigación, Spain.
3. PRAKASH, SURYA and KUMAR SANTOSH:Stochastic Behaviour a redundant complex system with imperfect switching over Devices Computing, Vol. 5, p. 136–143, 1970.