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"There are 1239 Steiner Triple Systems STS(31) of 2-rank 27."
Octavio Páez Osuna (2006)
- Octavio Páez Osuna:
There are 1239 Steiner Triple Systems STS(31) of 2-rank 27. Des. Codes Cryptogr. 40(2): 187-190 (2006)
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