TY - JOUR T1 - Singularly perturbed elliptic equations with symmetry: existence of solutions concentrating on spheres, Part I JF - Comm. Math. Phys. 235 (2003) no.3, 427-466 Y1 - 2003 A1 - Antonio Ambrosetti A1 - Andrea Malchiodi A1 - Wei-Ming Ni PB - Springer UR - http://hdl.handle.net/1963/1633 U1 - 2485 U2 - Mathematics U3 - Functional Analysis and Applications ER -