@article{MAN_1956__131_160477,
     author = {G.F.D. Duff},
     title = {Eigenvalues and {Maximal} {Domains} for a {Quasi-Linear} {Elliptic} {Equation.}},
     journal = {Mathematische Annalen},
     pages = {28--37},
     publisher = {mathdoc},
     volume = {131},
     year = {1956},
     zbl = {0072.31201},
     url = {http://geodesic.mathdoc.fr/item/MAN_1956__131_160477/}
}