@article{RM_1988_43_5_a11,
     author = {V. G. Ermakov},
     title = {Homotopy classification of a~certain set of multidimensional boundary-value problems of~oblique derivative type},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {217--218},
     publisher = {mathdoc},
     volume = {43},
     number = {5},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1988_43_5_a11/}
}