@article{MZ_1992__211_3_174429,
     author = {Hansj\"org Kielh\"ofer},
     title = {Smoothness of global positive branches of nonlinear elliptic problems over symmetric domains.},
     journal = {Mathematische Zeitschrift},
     pages = {41--48},
     publisher = {mathdoc},
     volume = {211},
     number = {3},
     year = {1992},
     zbl = {0780.35041},
     url = {http://geodesic.mathdoc.fr/item/MZ_1992__211_3_174429/}
}