@article{SM_1998_189_8_a5,
     author = {A. A. Oshemkov and V. V. Sharko},
     title = {Classification of {Morse--Smale} flows on two-dimensional manifolds},
     journal = {Sbornik. Mathematics},
     pages = {1205--1250},
     publisher = {mathdoc},
     volume = {189},
     number = {8},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_8_a5/}
}