The structure of triangle-free quasi-symmetric designs.

Nirmala B. Limaye Sharad S. Sane Mohan S. Shrikhande The structure of triangle-free quasi-symmetric designs. 199-207 1987 64 Discrete Mathematics 2-3 http://dx.doi.org/10.1016/0012-365X(87)90189-0 db/journals/dm/dm64.html#LimayeSS87