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MOC
2002
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Kirkman triple systems of order 21 with nontrivial automorphism group
There are 50,024 Kirkman triple systems of order 21 admitting an automorphism of order 2. There are 13,280 Kirkman triple systems of order 21 admitting an automorphism of order 3. ...
Myra B. Cohen, Charles J. Colbourn, Lee A. Ives, A...