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[2] M. S. Bartlett: An Introduction to Stochastic Processes with Special Reference to Methods and Applications. Cambridge University Press 1955. MR 0068772 | Zbl 0068.11801

[3] W. Feller: An Introduction to Probability Theory and its Applications. vol. 1; John Wiley, New York 1950. MR 0038583 | Zbl 0039.13201

[4] D. G. Kendall: On the Generalized Birth and Death Process. Ann. Math. Statistics 19 (1948), 1-15. DOI 10.1214/aoms/1177730285 | MR 0024091 | Zbl 0032.17604

[5] V. V. Stěpanov: Kurs diferenciálních rovnic. (Differential equations); (Czech translation, original in Russian), Přírodovědecké nakladatelství, Praha 1950.