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@article{MZ_1973__135_172010, author = {Dragomir Z. Djokovic}, title = {Level of a {Field} and the {Number} of {Square} {Classes.}}, journal = {Mathematische Zeitschrift}, pages = {267--270}, publisher = {mathdoc}, volume = {135}, year = {1973}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__135_172010/} }
Dragomir Z. Djokovic. Level of a Field and the Number of Square Classes.. Mathematische Zeitschrift, Tome 135 (1973), pp. 267-270. http://geodesic.mathdoc.fr/item/MZ_1973__135_172010/