@article{GDZPPN002228947, title = {Groenstein curves and symmetry of the semigroup of values.}, journal = {Manuscripta mathematica}, volume = {61}, year = {1988}, pages = {285-296}, zbl = {0692.13017}, url = {http://dml.mathdoc.fr/item/GDZPPN002228947} }
Delgado de la Manta, Félix de. Groenstein curves and symmetry of the semigroup of values.. Manuscripta mathematica, Tome 61 (1988) pp. 285-296. http://gdmltest.u-ga.fr/item/GDZPPN002228947/