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This work was done with the support of an S.R.C. grant and financial help from the Mathematics Faculty of the Open University.
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Vella, A.D. The malnormality of certain subgroups of small cancellation groups. Math Z 163, 187–189 (1978). https://doi.org/10.1007/BF01214065
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DOI: https://doi.org/10.1007/BF01214065