Geodesic
Free products of finite groups acting on regular rooted trees
Algebra and discrete mathematics, no. 2 (2007), pp. 91-103.

Voir la notice de l'article provenant de la source Math-Net.Ru

Let finite number of finite groups be given. Let $n$ be the largest order of their composition factors. We prove explicitly that the group of finite state automorphisms of rooted $n$-tree contains subgroups isomorphic to the free product of given groups. 
@article{ADM_2007_2_a7,
     author = {C. K. Gupta and N. D. Gupta and A. S. Oliynyk},
     title = {Free products of finite groups acting on regular rooted trees},
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     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2007_2_a7/}
}
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C. K. Gupta; N. D. Gupta; A. S. Oliynyk. Free products of finite groups acting on regular rooted trees. Algebra and discrete mathematics, no. 2 (2007), pp. 91-103. http://geodesic.mathdoc.fr/item/ADM_2007_2_a7/