@article{DCG_1988__3_1-2_131048,
     author = {Emo Welzl and H. Alt and Kurt Mehlhorn and Hubert Wagener},
     title = {Congruence, {Similarity,} and {Symmetries} of {Geometric} {Objects.}},
     journal = {Discrete & computational geometry},
     pages = {237--256},
     publisher = {mathdoc},
     volume = {3},
     number = {1-2},
     year = {1988},
     zbl = {0679.68070},
     url = {http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131048/}
}