@article{MAN_1978__232_163083,
     author = {Peter Landrock and Gerhard O. Michler},
     title = {Block {Structure} of the {Smallest} {Janko} {Group.}},
     journal = {Mathematische Annalen},
     pages = {205--238},
     publisher = {mathdoc},
     volume = {232},
     year = {1978},
     zbl = {0355.20012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__232_163083/}
}