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@article{MM2_1992__75_4_155721, author = {A. Ragusa and G. Paxia and G. Raciti}, title = {On the {L\"uroth} {Semigroup} of curves lying on a smooth quadric.}, journal = {Manuscripta mathematica}, pages = {225--246}, publisher = {mathdoc}, volume = {75}, number = {4}, year = {1992}, zbl = {0769.14012}, url = {http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155721/} }
A. Ragusa; G. Paxia; G. Raciti. On the Lüroth Semigroup of curves lying on a smooth quadric.. Manuscripta mathematica, Tome 75 (1992) no. 4, pp. 225-246. http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155721/