@article{MZ_1967__97_170725,
     author = {Matthew J. Hassett},
     title = {A {Note} on {Regressive} {Isols.}},
     journal = {Mathematische Zeitschrift},
     pages = {425--426},
     publisher = {mathdoc},
     volume = {97},
     year = {1967},
     zbl = {0189.01002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__97_170725/}
}