@article{MZ_1977__154_172503,
     author = {Peter Hess},
     title = {On {Uniqueness} of {Positive} {Solutions} of {Nonlinear} {Elliptic} {Boundary} {Value} {Problems.}},
     journal = {Mathematische Zeitschrift},
     pages = {17--18},
     publisher = {mathdoc},
     volume = {154},
     year = {1977},
     zbl = {0352.35046},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__154_172503/}
}