@article{MAN_1974__211_162642,
     author = {R.H. jr. Martin},
     title = {Nonlinear {Perturbations} of {Uncoupled} {Systems} of {Elliptic} {Operators.}},
     journal = {Mathematische Annalen},
     pages = {155--170},
     publisher = {mathdoc},
     volume = {211},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__211_162642/}
}