Nontrivial solutions for noncooperative elliptic systems at resonance. Silva, Elves A.B. — 2001 Electronic Journal of Differential Equations (EJDE) [electronic only]
Double resonant problems which are locally non-quadratic at infinity. Furtado, Marcelo F.; Silva, Elves A.B. — 2001 Electronic Journal of Differential Equations (EJDE) [electronic only]