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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 6, pp. 1155–1171, November–December, 1975.
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Ivanov, S.G. The occurrence problem for a free product of groups with an amalgamated subgroup. Sib Math J 16, 884–896 (1975). https://doi.org/10.1007/BF00967384
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DOI: https://doi.org/10.1007/BF00967384