@article{SM_1987_58_2_a15,
     author = {I. M. Ovsyannikov and L. P. Shilnikov},
     title = {On systems with a~saddle-focus homoclinic curve},
     journal = {Sbornik. Mathematics},
     pages = {557--574},
     publisher = {mathdoc},
     volume = {58},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_58_2_a15/}
}