@article{DCG_1995__13_3-4_131352,
     author = {C. Thomassen and R.B. Richter},
     title = {Intersections of {Curve} {Systems} and the {Crossing} {Number} of {C5} x {C5}  .},
     journal = {Discrete & computational geometry},
     pages = {149--160},
     publisher = {mathdoc},
     volume = {13},
     number = {3-4},
     year = {1995},
     url = {http://geodesic.mathdoc.fr/item/DCG_1995__13_3-4_131352/}
}