@article{MZ_1964__84_170279,
     author = {Zvonimir Janko},
     title = {Finite simple groups with short chains of subgroups.},
     journal = {Mathematische Zeitschrift},
     pages = {428--437},
     publisher = {mathdoc},
     volume = {84},
     year = {1964},
     zbl = {0119.02802},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__84_170279/}
}