@article{MT_2011_14_1_a2,
     author = {A. V. Greshnov},
     title = {On the generalized triangle inequality for quasimetrics induced by noncommuting vector fields},
     journal = {Matemati\v{c}eskie trudy},
     pages = {70--98},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2011_14_1_a2/}
}