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@article{JRAM_1977__295_151926, author = {Jan van Leeuwen}, title = {An extension of {Hansen's} theorem for star chains.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {202--207}, publisher = {mathdoc}, volume = {295}, year = {1977}, zbl = {0355.10040}, url = {http://geodesic.mathdoc.fr/item/JRAM_1977__295_151926/} }
Jan van Leeuwen. An extension of Hansen's theorem for star chains.. Journal für die reine und angewandte Mathematik, Tome 295 (1977), pp. 202-207. http://geodesic.mathdoc.fr/item/JRAM_1977__295_151926/