@article{MZ_1963__82_170172,
     author = {Zvonimir Janko},
     title = {Finite groups with invariant fourth maximal subgroups.},
     journal = {Mathematische Zeitschrift},
     pages = {82--89},
     publisher = {mathdoc},
     volume = {82},
     year = {1963},
     zbl = {0118.26704},
     url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170172/}
}