1. R.D. Baker andG.L. Ebert. A new class of translation planes. Combinatorics '86 (Trento, 1986), 7?20, Ann. Discrete Math. 37, North-Holland, Amsterdam, 1988.
2. D. Betten. 4-dimensionale Translationsebenen mit 8-dimensionaler Kollineationsgruppe. Geom. Dedicata2 (1973), 327?339.
3. M.Biliotti and N.L.Johnson. Bilinear flocks of quadratic cones. (Preprint).
4. F. De Clerck andH. Van Maldeghem. On flocks of infinite quadratic cones. Bull. Belg. Math. Soc. Simon Stevin1 (1994), 399?415.
5. G.L. Ebert. Some nonreplaceable nests. Combinatorics '88, vol. 1 (Ravello, 1988), 353?372, Res. Lecture Notes Math., Mediterranean, Rende, 1991.