@article{GDZPPN002421372, title = {Conservative Quadratic Forms.}, journal = {Mathematische Zeitschrift}, volume = {162}, year = {1978}, pages = {15-24}, zbl = {0371.15011}, url = {http://dml.mathdoc.fr/item/GDZPPN002421372} }
Shapiro, Daniel B.; Gentile, Enzo R. Conservative Quadratic Forms.. Mathematische Zeitschrift, Tome 162 (1978) pp. 15-24. http://gdmltest.u-ga.fr/item/GDZPPN002421372/