@article{RM_1997_52_3_a11,
     author = {M. V. Shamolin},
     title = {Spatial topographical systems of {Poincar\'e} and comparison systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {621--622},
     publisher = {mathdoc},
     volume = {52},
     number = {3},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1997_52_3_a11/}
}