@article{MS2_1979__45_166658,
     author = {Dag Normann},
     title = {A note on reflection.},
     journal = {Mathematica Scandinavica},
     pages = {5--12},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0428.03040},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166658/}
}