no. 1
A Kummer criterion for imaginary quadratic fields
Compositio Mathematica, Tome 47 (1982) no. 1, pp. 31-42 
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     author = {Yager, Rodney I.},
     title = {A {Kummer} criterion for imaginary quadratic fields},
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     publisher = {Martinus Nijhoff Publishers},
     volume = {47},
     number = {1},
     mrnumber = {668779},
     zbl = {0506.12008},
     language = {en},
     url = {https://www.numdam.org/item/CM_1982__47_1_31_0/}
}
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Yager, Rodney I. A Kummer criterion for imaginary quadratic fields. Compositio Mathematica, Tome 47 (1982) no. 1, pp. 31-42. https://www.numdam.org/item/CM_1982__47_1_31_0/

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