@article{ELMA_1980__35_141243,
     author = {Detlef Laugwitz},
     title = {Quadratsummen in {Restklassenringen.}},
     journal = {Elemente der Mathematik},
     pages = {73--79},
     publisher = {mathdoc},
     volume = {35},
     year = {1980},
     zbl = {0441.10003},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1980__35_141243/}
}