@article{MM2_1989__65_3_155431,
     author = {Donato Passaseo},
     title = {Multiplicity of positive solutions of nonlinear elliptic equations with critical sobolev exponent in some contractible domains.},
     journal = {Manuscripta mathematica},
     pages = {147--166},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1989},
     zbl = {0701.35068},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155431/}
}