1. Aki, S. (1992). Waiting time problems for a sequence of discrete random variables, Annals of the Institute of Statistical Mathematics, 44, 363–378.
2. Aki, S., Balakrishnan, N. and Mohanty, S. G. (1996). Sooner and later waiting time problems for success and failure runs in higher order Markov dependent trials, Annals of the Institute of Statistical Mathematics, 48, 773–787.
3. Aki, S. and Hirano, K. (1993). Discrete distributions related to succession events in a two-state Markov chain, In Statistical Science & Data Analysis (Eds., K. Matusita, M. L. Puri and T. Hayakawa), pp. 467–474, Utrecht: VSP Publishers.
4. Aki, S. and Hirano, K. (1994). Distributions of numbers of failures and successes until the first consecutive k successes, Annals of the Institute of Statistical Mathematics, 46, 193–202.
5. Balasubramanian, K., Viveros, R. and Balakrishnan, N. (1993). Sooner and later waiting time problems for Markovian Bernoulli trials, Statistics & Probability Letters, 18, 153–161.