@article{JTNB_1997__9_1_25_0,
     author = {Fernando Chamizo},
     title = {Sums of squares in $\mathbb {Z}[\sqrt{k}]$},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {25--39},
     publisher = {Universit\'e Bordeaux I},
     volume = {9},
     number = {1},
     year = {1997},
     zbl = {0924.11081},
     mrnumber = {1469659},
     language = {en},
     url = {https://jtnb.centre-mersenne.org/item/JTNB_1997__9_1_25_0/}
}