TY  - JOUR
AU  - Cordaro, Paulo D.
AU  - Hanges, Nicholas
TI  - A New Proof of Okaji’s Theorem  for a Class of Sum of Squares Operators
JO  - Annales de l'Institut Fourier
PY  - 2009
SP  - 595
EP  - 619
VL  - 59
IS  - 2
PB  - Association des Annales de l’institut Fourier
UR  - http://www.numdam.org/articles/10.5802/aif.2442/
DO  - 10.5802/aif.2442
LA  - en
ID  - AIF_2009__59_2_595_0
ER  -