@article{PMF_1911_22_1_a5,
     author = {Miller, G. A.},
     title = {Extension of a group by operators of orders two and four.},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {69--71},
     year = {1911},
     volume = {22},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PMF_1911_22_1_a5/}
}