1. A. BLOKHUIS and H.A. WILBRINK,A characterization of exterior lines of certain sets of points in PG(2,q), Geom. Dedicata 23 (1987) 253?254
2. A. BLOKHUIS and F. MAZZOCCA,On maximal sets of nuclei in PG(n, q) and quasi-odd sets in AG(2, q), Proceedings of the Isle of Thorns Conference, 1990, in press
3. A.A. Bruen and F. Mazzocca,Nuclei of sets of points in finite affine and projective spaces, preprint, 1990