TY  - JOUR
AU  - A. Schinzel
TI  - On Sums of Four Coprime Squares
JO  - Bulletin of the Polish Academy of Sciences. Mathematics
PY  - 2013
SP  - 109
EP  - 111
VL  - 61
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ba61-2-3/
DO  - 10.4064/ba61-2-3
LA  - en
ID  - 10_4064_ba61_2_3
ER  -