@article{RM_1979_34_2_a8,
     author = {A. G. Fedotov},
     title = {An~estimate of~the~number of~invariant tori of~a~dynamical system on a~manifold with boundary},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {225--226},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_2_a8/}
}