TY  - JOUR
AU  - Hardy, John
TI  - A note on the representability of quaternary quadratic forms as sums of squares of two linear forms
JO  - Portugaliae mathematica
PY  - 1970
SP  - 161
EP  - 164
VL  - 29
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1970__29_3_115123/
LA  - en
ID  - PORMA_1970__29_3_115123
ER  -