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"The P-geometry for M23 has no Non-trivial 2-coverings."
Alexandre A. Ivanov, Sergey V. Shpectorov (1990)
- Alexandre A. Ivanov, Sergey V. Shpectorov
:
The P-geometry for M23 has no Non-trivial 2-coverings. Eur. J. Comb. 11(4): 373-379 (1990)

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