@article{MZ_1965__90_170480,
     author = {Hans Jorgen Munkholm},
     title = {On the classification of incidence thorems in plane projective geometry.},
     journal = {Mathematische Zeitschrift},
     pages = {215--230},
     year = {1965},
     volume = {90},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__90_170480/}
}