1. Kishor Trivedi; Joanne Bechta Dugan; Robert Dugan; and Mark Smotherman: Modeling Imperfect Coverage in Fault-Tolerant Systems. The Fourteenth International Conference on Fault-Tolerant Computing - FTCS 14, Digest of Papers, 1984, pp.77-82.
2. Daniel P. Siewiorek and Robert S. Swarz: The Theory and Practice of Reliable System e s i E Digital Press, 1982, pp.31-57.