ERGODICITY AND TRUNCATION BOUNDS FOR INHOMOGENEOUS BIRTH AND DEATH PROCESSES WITH ADDITIONAL TRANSITIONS FROM AND TO ORIGIN Статья Zeifman A., Korotysheva A., Satin Y., Razumchik R., Korolev V., Shorgin S. Stochastic Models. Taylor and Francis Inc.. Том 33. 2017. С. 598-616