@article{ZNSL_2003_300_a14,
     author = {V. S. Gonchenko and I. I. Ovsyannikov},
     title = {On bifurcations of three-dimensional diffeomorphisms with a~homoclinic tangency to a~``neutral'' saddle fixed point},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {167--172},
     publisher = {mathdoc},
     volume = {300},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_300_a14/}
}