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Work supported through Grant MCS 77-01807-A01 of the National Science Foundation.
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Magnus, W. The uses of 2 by 2 matrices in combinatorial group theory. A survey. Results. Math. 4, 171–192 (1981). https://doi.org/10.1007/BF03322976
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DOI: https://doi.org/10.1007/BF03322976