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"Structure and uniqueness of the (81, 20, 1, 6) strongly regular graph."
Andries E. Brouwer, Willem H. Haemers (1992)
- Andries E. Brouwer, Willem H. Haemers:
Structure and uniqueness of the (81, 20, 1, 6) strongly regular graph. Discret. Math. 106-107: 77-82 (1992)
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