@article{MZM_1984_36_5_a5,
     author = {L. A. Belyakov},
     title = {Bifurcation of systems with homoclinic curve of a saddle-focus with saddle quantity zero},
     journal = {Matemati\v{c}eskie zametki},
     pages = {681--689},
     year = {1984},
     volume = {36},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1984_36_5_a5/}
}