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@article{CM_1982__47_1_31_0, author = {Yager, Rodney I.}, title = {A {Kummer} criterion for imaginary quadratic fields}, journal = {Compositio Mathematica}, pages = {31--42}, publisher = {Martinus Nijhoff Publishers}, volume = {47}, number = {1}, year = {1982}, mrnumber = {668779}, zbl = {0506.12008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1982__47_1_31_0/} }
Yager, Rodney I. A Kummer criterion for imaginary quadratic fields. Compositio Mathematica, Tome 47 (1982) no. 1, pp. 31-42. http://geodesic.mathdoc.fr/item/CM_1982__47_1_31_0/