Block designs with repeated blocks. - Jacobus H. van Lint; H. J. Ryser (Discret. Math., 1972)

Symmetric Designs and Related Configurations. - H. J. Ryser (J. Comb. Theory A, 1972)

Intersection Properties of Finite Sets. - H. J. Ryser (J. Comb. Theory A, 1973)

Subsets of a Finite Set That Intersect Each Other in At Most One Element. - H. J. Ryser (J. Comb. Theory A, 1974)

A Theorem on Block Designs. - H. J. Ryser (J. Comb. Theory A, 1974)

The Factors of a Design Matrix. - H. J. Ryser (J. Comb. Theory A, 1977)

D. Ray Fulkerson 1924-1976. - H. J. Ryser (J. Comb. Theory B, 1977)

The Existence of Symmetric Block Designs. - H. J. Ryser (J. Comb. Theory A, 1982)

Set Intersection Matrices. - H. J. Ryser (J. Comb. Theory A, 1982)

Matrices and set differences. - H. J. Ryser (Discret. Math., 1984)