TY  - JOUR
AU  - J. W. S. Cassels
TI  - On sums of squares
JO  - Informatics and Automation
PY  - 1973
SP  - 114
EP  - 117
VL  - 132
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1973_132_a14/
LA  - ru
ID  - TRSPY_1973_132_a14
ER  -