@article{ZNSL_2000_266_a5,
     author = {V. V. Dontsov},
     title = {Nilmanifolds with {Carnot{\textendash}Carath\'eodory} metrics},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {64--75},
     year = {2000},
     volume = {266},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_266_a5/}
}