MathSciNet bibliographic data

MR1067208 (91j:51018) 51E24 (20D08) Ivanov, A. A.; Shpectorov, S. V. The $P$-geometry for $M\sb {23}$ has no nontrivial $2$-coverings. European J. Combin. 11 (1990), no. 4, 373--379.

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