1. Symmetry of ground states of quasilinear elliptic equations;Serrin;Arch. Ration. Mech. Anal.,1999
2. Positive entire solutions of singular nonlinear polyharmonic equations on R2;Xu;Acta Math. Sinica A,2003
3. Positive solutions of a class of second order semilinear elliptic equations in the plane;Kusano;Math. Ann.,1984
4. On positive entire solutions to singular nonlinear polyharmonic equations;Wu;Acta Math. Sinica A,2003
5. On positive entire solutions to singular nonlinear polyharmonic equations in RN;Wu;System Sci. Math. A,2004