@article{SM_2000_191_5_a2,
     author = {B. M. Dubrov and B. P. Komrakov},
     title = {The problem of constructive equivalence in differential geometry},
     journal = {Sbornik. Mathematics},
     pages = {655--681},
     publisher = {mathdoc},
     volume = {191},
     number = {5},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2000_191_5_a2/}
}