Geodesic
Free products of networks and free symmetrizers of graphs
Sbornik. Mathematics, Tome 27 (1975) no. 4, pp. 463-480

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Connected locally finite vertex-symmetric graphs, also called networks, are the subject of the article. The operation of a free product, preserving the vertex symmetry of graphs, is introduced. Properties of free products are studied, and a connection with free products of groups is established. A class of networks, called free symmetrizers of graphs, in some respects analogues of free products, is introduced. Their properties and a relation to free products and graphs of groups are studied. Figures: 3. Bibliography: 12 titles. 
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     author = {D. V. Znoiko},
     title = {Free products of networks and free symmetrizers of graphs},
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D. V. Znoiko. Free products of networks and free symmetrizers of graphs. Sbornik. Mathematics, Tome 27 (1975) no. 4, pp. 463-480. http://geodesic.mathdoc.fr/item/SM_1975_27_4_a1/