@article{TM_2007_258_a3, author = {F. Aicardi and V. A. Timorin}, title = {On {Binary} {Quadratic} {Forms} with the {Semigroup} {Property}}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {28--48}, publisher = {mathdoc}, volume = {258}, year = {2007}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TM_2007_258_a3/} }