@article{CMH_1978__53_139736,
     author = {John Franks},
     title = {The periodic structure of non-singular {Morse-Smale} flows.},
     journal = {Commentarii mathematici Helvetici},
     pages = {279--294},
     year = {1978},
     volume = {53},
     zbl = {0403.58008},
     url = {http://geodesic.mathdoc.fr/item/CMH_1978__53_139736/}
}