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"On the Automorphism Group of a Planar Hypermap."
Robert Cori et al. (1981)
- Robert Cori, Antonio Machi, Jean-Guy Penaud, Bernard Vauquelin:
On the Automorphism Group of a Planar Hypermap. Eur. J. Comb. 2(4): 331-334 (1981)
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