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Tver’. Translated fromSibirskiĭ Matematicheskiĭ Zhurnal, Vol. 40, No. 6, pp. 1397–1408, November–December, 1999.
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Faĭziev, V.A. Pseudocharacters of a free group which are invariant under the group of substitution automorphisms. Sib Math J 40, 1188–1198 (1999). https://doi.org/10.1007/BF02677543
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DOI: https://doi.org/10.1007/BF02677543