@article{AUPO_2016__55_1_a7,
     author = {Kuzmina, Irina~A. and Chodorov\'a, Marie},
     title = {The {Group} of {Invertible} {Elements} of the {Algebra} of {Quaternions}},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {53--58},
     publisher = {mathdoc},
     volume = {55},
     number = {1},
     year = {2016},
     mrnumber = {3674600},
     zbl = {1362.16024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2016__55_1_a7/}
}