@article{MZ_1957__68_169718,
     author = {Norman Blackburn},
     title = {\"Uber das {Produkt} von zwei zyklischen {2-Gruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {422--427},
     publisher = {mathdoc},
     volume = {68},
     year = {1957},
     zbl = {0079.03102},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__68_169718/}
}