@article{TRSPY_2008_263_a15,
     author = {M. I. Shtogrin},
     title = {Piecewise {Smooth} {Developable} {Surfaces}},
     journal = {Informatics and Automation},
     pages = {227--250},
     publisher = {mathdoc},
     volume = {263},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2008_263_a15/}
}