TY  - JOUR
AU  - Yiu, Paul Y. H.
TI  - Sums of Squares Formulae With Integer Coefficients
JO  - Canadian mathematical bulletin
PY  - 1987
SP  - 318
EP  - 324
VL  - 30
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-045-6/
DO  - 10.4153/CMB-1987-045-6
ID  - 10_4153_CMB_1987_045_6
ER  -