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- [1] STRONGLY REGULAR GRAPHS AND QUASI-SYMMETRIC DESIGNS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (01): : A38 - A38
- [3] THE NONISOMORPHISM OF THE STRONGLY REGULAR GRAPHS DERIVED FROM THE QUASI-SYMMETRIC 2-(31, 7, 7) DESIGNS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1987, 40 (05): : 33 - 35