Yang,"min Bo",shen,"zi Fei, Infinitely many solutions for a class of fourth order elliptic equations in R N, Acta mathematica Sinica. English series (Print) , 24(8), 2008, pp. 1269-1278
With the aids of variational method and concentration-compactness principle, infinitely many solutions are obtained for a class of fourth order elliptic equations with singular potential .2u=.|u|2..(s).2u|x|s+.k(x)|u|r.2u,u.H2,2(RN).