Some characterizations of type-1 λ-designs

Bridges, 1970, Some results on λ-designs, J. Combin. Theory, 8, 350, 10.1016/S0021-9800(70)80030-8 Bridges, 1977, A characterization of type-1 λ-designs, J. Combin. Theory Ser. A, 22, 361, 10.1016/0097-3165(77)90010-3 Bridges, 1970, The determination of all λ-designs with λ = 3, J. Combin. Theory, 8, 343, 10.1016/S0021-9800(70)80029-1 deBruijn, 1948, On a combinatorial problem, Indag. Math., 10, 421 Hall, 1967 Kramer, 1969, On λ-designs Kramer, 1974, On λ-designs, J. Combin. Theory Ser. A, 16, 57, 10.1016/0097-3165(74)90072-7 Ryser, 1968, An extension of a theorem of deBruijn and Erdős on combinatorial designs, J. Algebra, 10, 246, 10.1016/0021-8693(68)90099-9 Shrikhande, 1976, On the λ-design conjecture, Utilitas Math., 9, 301 Shrikhande, 1984, Some combinatorial problems, 340 Woodall, 1970, Square λ-linked designs, 20, 669 Woodall, 1971, Square λ-linked designs: A survey, 349