@article{SEMR_2018_15_a123,
     author = {V. V. Aseev},
     title = {The coefficient of quasim\"obiusness in {Ptolemaic} spaces},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {246--257},
     publisher = {mathdoc},
     volume = {15},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2018_15_a123/}
}