Geodesic
Free and nonfree subgroups of $PSL_2(\mathbf C)$ generated by two parabolic elements
Sbornik. Mathematics, Tome 35 (1979) no. 1, pp. 49-55 Cet article a éte moissonné depuis la source Math-Net.Ru

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Free and nonfree subgroups of $PSL_2(\mathbf C)$ generated by two parabolic elements are studied. Bibliography: 10 titles. 
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Yu. A. Ignatov. Free and nonfree subgroups of $PSL_2(\mathbf C)$ generated by two parabolic elements. Sbornik. Mathematics, Tome 35 (1979) no. 1, pp. 49-55. http://geodesic.mathdoc.fr/item/SM_1979_35_1_a3/

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