no. 1
The genus class group I
Séminaire de théorie des nombres de Bordeaux, Série 2, Tome 4 (1992) no. 1, pp. 97-111 
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     author = {Fr\"ohlich, A.},
     title = {The genus class group {I}},
     journal = {S\'eminaire de th\'eorie des nombres de Bordeaux},
     pages = {97--111},
     year = {1992},
     publisher = {Universit\'e Bordeaux I},
     volume = {Ser. 2, 4},
     number = {1},
     mrnumber = {1183920},
     zbl = {0769.11040},
     language = {en},
     url = {https://www.numdam.org/item/JTNB_1992__4_1_97_0/}
}
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Fröhlich, A. The genus class group I. Séminaire de théorie des nombres de Bordeaux, Série 2, Tome 4 (1992) no. 1, pp. 97-111. https://www.numdam.org/item/JTNB_1992__4_1_97_0/

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