@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/