2 citations to https://www.mathnet.ru/rus/tvp323

1. Penisson S., “Beyond the Q-Process: Various Ways of Conditioning the Multitype Galton-Watson Process”, ALEA-Latin Am. J. Probab. Math. Stat., 13:1 (2016), 223–237      
2. Reder C., “Transient behaviour of a Galton–Watson process with a large number of types”, Journal of Applied Probability, 40:4 (2003), 1007–1030