@article{CMUC_2004__45_2_a15,
     author = {Ungar, Abraham A.},
     title = {The hyperbolic triangle centroid},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {355--369},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {2004},
     mrnumber = {2075283},
     zbl = {1099.51008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2004__45_2_a15/}
}