1. S. K. Srinivasan, On a Class of Non-Markovian Processes, I.I. T. preprint (1962).
2. S. K. Srinivasan, Nuovo Cimento 38: 979 (1965).
3. S. K. Srinivasan and R. Vasudevan, On a Class of Non-Markovian Processes Associated with Correlated Pulse Trains and Their Application to Barkhausen Noise, I. I. T. Research Report No. 4 (1965).
4. L. Takacs, On secondary processes generated by a Poisson process and their applications in physics, Acta Math. Acad. Sci. Hung. 5: 203–236 (1954).
5. M. S. Bartlett, Stochastic Processes, Cambridge University Press (1955), p. 54.