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[Cu1]

R. Curtis, ``The Steiner system , the Mathieu group , and the kitten,'' in Computational group theory, ed. M. Atkinson, Academic Press, 1984.

[Cu2]

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[Co1]

J. Conway, ``Hexacode and tetracode - MINIMOG and MOG,'' in Computational group theory, ed. M. Atkinson, Academic Press, 1984.

[Co2]

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[CS1]

J. Conway and N. Sloane, Sphere packings, Lattices and groups, 3rd ed., Springer-Verlag, 1999.

[CS2]

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[KR]

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