Geodesic
Some diophantine systems
Zapiski Nauchnykh Seminarov POMI, Integral lattices and finite linear groups, Tome 116 (1982), pp. 155-160 
O. M. Fomenko. Some diophantine systems. Zapiski Nauchnykh Seminarov POMI, Integral lattices and finite linear groups, Tome 116 (1982), pp. 155-160. http://geodesic.mathdoc.fr/item/ZNSL_1982_116_a14/
@article{ZNSL_1982_116_a14,
     author = {O. M. Fomenko},
     title = {Some diophantine systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {155--160},
     year = {1982},
     volume = {116},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1982_116_a14/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

Using known results concerning the representation of binary forms as sums of three or four squares of linear forms we derive an asymptotic formula connected with the representation of integers in an imaginary quadratic number field $R$ as sums of three or four squares of integers from $R$.