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@article{MOMA_1978__85_177867, author = {William A. Veech}, title = {Quasiregular {Points} and {Time} {Changes.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {245--252}, publisher = {mathdoc}, volume = {85}, year = {1978}, zbl = {0398.28022}, url = {http://geodesic.mathdoc.fr/item/MOMA_1978__85_177867/} }
William A. Veech. Quasiregular Points and Time Changes.. Monatshefte für Mathematik, Tome 85 (1978), pp. 245-252. http://geodesic.mathdoc.fr/item/MOMA_1978__85_177867/