@article{JRAM_1980__316_152248,
     author = {Rudolf Scharlau},
     title = {On the {Pythagoras} number of orders in totally real number fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {208--210},
     publisher = {mathdoc},
     volume = {316},
     year = {1980},
     zbl = {0421.12017},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__316_152248/}
}