@article{IM2_1995_44_1_a2,
     author = {M. D. Kovalev},
     title = {Geometric theory of hinged devices},
     journal = {Izvestiya. Mathematics },
     pages = {43--68},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1995_44_1_a2/}
}