@article{10_4064_ap_26_1_53_60,
     author = {Walter Benz},
     title = {The n-point-invariants of the projective line and cross-ratios of n-tuples},
     journal = {Annales Polonici Mathematici},
     pages = {53--60},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1972},
     doi = {10.4064/ap-26-1-53-60},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-1-53-60/}
}