On Semipartial Geometries. - I. Debroey; Joseph A. Thas (J. Comb. Theory A, 1978)

Non-trivial GammaDelta-regular graphs. - I. Debroey; Frank De Clerck (Discret. Math., 1982)

The embedding of (0, alpha)-geometries in PG(n, q): part II. - Joseph A. Thas; I. Debroey; Frank De Clerck (Discret. Math., 1984)