no. 1
A simplified proof of the Sevastyanov theorem on branching processes
Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Volume 6 (1970) no. 1, pp. 1-7. 
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     author = {Ji\v{r}ina, Miloslav},
     title = {A simplified proof of the {Sevastyanov} theorem on branching processes},
     journal = {Annales de l'institut Henri Poincar\'e. Section B. Calcul des probabilit\'es et statistiques},
     pages = {1--7},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {1},
     year = {1970},
     zbl = {0213.19503},
     mrnumber = {266318},
     language = {en},
     url = {http://www.numdam.org/item/AIHPB_1970__6_1_1_0/}
}
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Jiřina, Miloslav. A simplified proof of the Sevastyanov theorem on branching processes. Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Volume 6 (1970) no. 1, pp. 1-7. http://www.numdam.org/item/AIHPB_1970__6_1_1_0/

[1] B.A. Sevastyanov, Theory of branching processes, (Russian) Uspekhi mat. nauk., 6 (6), 1951, 47-99. | MR | Zbl