[1] BERZ E.:
Kegelschnitte in Desarguesian Ebenen. Math. Z. 78 (1962).
MR 0139065
[3] HUGHES D. R.-PIPER F. C.:
Projective Planes. Springer-Verlag, New York-Heidleberg-Berlin, 1973.
MR 0333959 |
Zbl 0267.50018
[4] CHVÁL V.: Some properties of quadrics in Hjelmslev plane. Technical report I-4-2/9a, PF UPJŠ, Košice, 1975. (Slovak)
[5] JURGA R.:
Some combinatorial properties of conies in the Hjelmslev plane. Math. Slovaca 45 (1995), 219-226.
MR 1361814
[6] PRIMROSE E. J. F.:
Quadrics in finite geometries. Proc. Cambridge Philos. Soc. 147 (1951).
MR 0041460 |
Zbl 0042.38803