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[KM02] Kapovich, I. and Myasnikov, A., Stallings foldings and subgroups of free groups, J. of Algebra, 248 (2002), 608--668.
[MMP+95] Matz, O., Miller, A., Potthoff, A., Thomas, W. and Valkema, E., Report on the program AMoRe, Christian Albrechts Universit{\"a}t, Kiel (9507) (1995).
[MSW01] Margolis, S., Sapir, M. and Weil, P., Closed subgroups in pro-V topologies and the extension problem for inverse automata, Int. J. of Algebra and Computation, 11 (2001), 405--445.
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