@article{AA_1992_4_4_a4,
     author = {V. F. Lazutkin},
     title = {An analytic integral along the separatrix of the semistandard map:existence and an exponential estimate for the distance between the stable and unstable separatrices},
     journal = {Algebra i analiz},
     pages = {110--142},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_1992_4_4_a4/}
}