@article{ND_2010_6_1_a3,
     author = {S. V. Gonchenko and I. I. Ovsyannikov},
     title = {On bifurcations of three-dimensional diffeomorphisms with a non-transversal heteroclinic cycle containing saddle-foci},
     journal = {Russian journal of nonlinear dynamics},
     pages = {61--77},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2010_6_1_a3/}
}