@article{GDZPPN002233096,
title = {On the L\"uroth Semigroup of curves lying on a smooth quadric.},
journal = {Manuscripta mathematica},
volume = {76},
year = {1992},
pages = {225-246},
zbl = {0769.14012},
url = {http://dml.mathdoc.fr/item/GDZPPN002233096}
}
Ragusa, A.; Paxia, G.; Raciti, G. On the Lüroth Semigroup of curves lying on a smooth quadric.. Manuscripta mathematica, Tome 76 (1992) pp. 225-246. http://gdmltest.u-ga.fr/item/GDZPPN002233096/