@article{GDZPPN002201720,
title = {Double-points of compositions.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {346},
year = {1984},
pages = {71-80},
zbl = {0534.14003},
url = {http://dml.mathdoc.fr/item/GDZPPN002201720}
}
Hansen, Johan P. Double-points of compositions.. Journal für die reine und angewandte Mathematik, Tome 346 (1984) pp. 71-80. http://gdmltest.u-ga.fr/item/GDZPPN002201720/