%0 Journal Article
%A Fernando Galván, José Francisco
%T Positive semidefinite germs in real analytic surfaces.
%D 2002
%@ 0025-5831
%U https://hdl.handle.net/20.500.14352/57240
%X We find all real analytic surface germs in R3 on which every positive semidefinite function germ is a sum of squares (in fact, of two squares) of analytic function germs.
%~