@article{MZ_1967__95_170658,
     author = {F.H. Simons},
     title = {A {Not} on {Exit} {Time} under {Transformations.}},
     journal = {Mathematische Zeitschrift},
     pages = {324--330},
     publisher = {mathdoc},
     volume = {95},
     year = {1967},
     zbl = {0152.24401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__95_170658/}
}