@article{MZ_1969__112_171220,
     author = {Harold N. Ward},
     title = {Automorphisms of {Quaternion-Free} {2-Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {52--58},
     publisher = {mathdoc},
     volume = {112},
     year = {1969},
     zbl = {0214.04203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__112_171220/}
}