@article{ZNSL_2003_300_a13,
     author = {S. V. Gonchenko and L. P. Shilnikov},
     title = {On two-dimensional area-preserving maps with homoclinic tangencies that have infinitely many generic elliptic periodic points},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {155--166},
     publisher = {mathdoc},
     volume = {300},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_300_a13/}
}