@article{MS2_1967__21_166021,
     author = {Oma Hamara},
     title = {On the {Structure} of the {Orthogonal} {Group.}},
     journal = {Mathematica Scandinavica},
     pages = {219--232},
     publisher = {mathdoc},
     volume = {21},
     year = {1967},
     zbl = {0186.04401},
     url = {http://geodesic.mathdoc.fr/item/MS2_1967__21_166021/}
}