Some quasilinear elliptic equations involving multiple $p$-Laplacians
  This paper is devoted to the study, with variational technique, of (p,q)-Laplacian equations in presence of general nonlinearities. Especially we obtain the existence result for the zero mass case, which includes a large class of pure power nonlinearities. More general quasilinear problems of Born-Infeld type are also considered. 
Alessio Pomponio, Tatsuya Watanabe
math.AP math-ph math.MP