Wong, E., B. Hajek. Stochastic processes in engineering systems. (Springer texts in electrical engineering.) Springer‐Verlag, New York — Berlin — Heidelberg — Tokyo, ISBN 0–387–96061–9; Springer‐Verlag, Berlin ‐ Heidelberg ‐ New Yor̀k ‐ Tokyo, ISBN‐3–540–96061–9; 1985, XI, 361 pp., DM 98