1. Bagchi, B. and Sastry, N. S. N.: Even order inversive planes, generalized quadrangles and codes,Geom. Dedicata 22 (1987), 137?147.
2. Bagchi, B. and Sastry, N. S. N.: Intersection patterns of the classical ovoids in sympletic 3-space of even order,J. Algebra 126 (1989), 147?160.
3. Barlotti, A.: Some topics in finite geometrical structures,Institute of Statistics Mimeo Series, No. 439, University of North Carolina, 1965.
4. Baer, R.:Linear Algebra and Projective Geometry, Academic Press, New York, 1952.
5. Fellegara, G.: Gli ovaloidi di uno spazio tredimensionale di Galois di ordine 8,Atti Accad. Naz. Lincei Rend. 32 (1962), 170?176.