@misc{ND_2016_12_3_a8,
     title = {Afterword to the paper by {N.N.} {Nekhoroshev}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {542--552},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2016_12_3_a8/}
}