@article{ISU_2018_18_3_a1,
     author = {S. V. Galaev},
     title = {Classification of prolonged bi-metric structures on distributions of non-zero curvature of {sub-Riemannian} manifolds},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {263--273},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2018_18_3_a1/}
}