@article{MT_2018_21_2_a6,
     author = {A. V. Greshnov},
     title = {Symmetrizations of distance functions and $f$-quasimetric spaces},
     journal = {Matemati\v{c}eskie trudy},
     pages = {150--162},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2018_21_2_a6/}
}