Estimates for critical groups of solutions to quasilinear elliptic systems. Carmona, José, Cingolani, Silvia, Vannella, Giuseppina (2003) Electronic Journal of Differential Equations (EJDE) [electronic only]
Estudio de las variedades de contacto compactas que admiten una acción foliante. Rafael María Rubio Ruiz (2003) Extracta Mathematicae