Publisher
Springer Science and Business Media LLC
Reference6 articles.
1. B. Gr�nbaum,Arrangements and Spreads, Amer. Math. Soc., Providence, R.I., 1972.
2. F. Levi, Die Teilung der projektiven Ebene durch Gerade oder Pseudogerade,Ber. Math. Phys. Kl. S�chs. Akad. Wiss. Leipzig 21 (1926), 256?267.
3. L. M. Kelly andW. O. J. Moser, On the number of ordinary lines determined byn points,Canad. J. Math. 10 (1958), 210?219.
4. G. Purdy, Triangles in arrangements of lines,Discrete Math. 25 (1959), 157?163.
5. G. Purdy, Triangles in arrangements of lines. II,Proc. Amer. Math. Soc. 79 (1980), 77?81.