On the graphical characterization of the projective space over a finite field. - Minoru Numata (J. Comb. Theory B, 1985)

A characterization of Grassmann and Johnson graphs. - Minoru Numata (J. Comb. Theory B, 1990)

A characterization of some graphs which do not contain 3-claws. - Andries E. Brouwer; Minoru Numata (Discret. Math., 1994)