@article{MZ_1984__187_173478,
     author = {H-O. Peitgen and A.J. Tromba},
     title = {Unfolding {Bifucations} of an {Elliptic} {Boundary} {Value} {Problem.}},
     journal = {Mathematische Zeitschrift},
     pages = {145--150},
     publisher = {mathdoc},
     volume = {187},
     year = {1984},
     zbl = {0526.35011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__187_173478/}
}