1. D. G. Konstantinidis, Monotone Trajectory Principle for a Complex Renewal
System with one Repair Unit,  Moscow Univ. Mathematics Bulletin,
45, No.2, 9-14, 1990. pdf.

2. D. G. Konstantinidis, A. D. Solovyev, Uniform Estimate of Reliability for
a Complex Regenerated System with Unlimited Number of Repair Units,
Moscow Univ. Mathematics Bulletin46, No.3, 21-24, 1991. pdf.

3. A. D. Solovyev, D. G. Konstant, Reliability Estimation for a Complex
Renewable System with an Unbounded Number of Repair Units.  J. Appl.
Prob
.,  28, No. 4, 833-842, 1991. pdf.

5. V. V. Kalashnikov, D. G. Konstantinidis, Ruin Probability,
Fundamentalnaya i Prikladnaya Matematika2, No.4, 1055-1100, 1996. pdf.