1. L. Bader, G. Lunardon,On the flocks of Q + (3,q), to appear.
2. W. Benz, ?Vorlesungen über Geometrie der Algebren,? Springer, Berlin et al., 1973.
3. T. Beth, D. Jungnickel, H. Lenz, ?Design Theory?, Cambridge Univ. Press, Cambridge et al., 1986.
4. A. Bonisoli,The regular subgroups of the sharply ?transitive finite permutation groups, Ann. Disc. Math. 37 (1988), 75?86
5. A. Bonisoli,Insiemi di permutazioni e (B) ?geometrie, tesi di dottorato, Modena, 1988.