@article{articlefcacaae4,
title   = {On the variations of the Betti numbers of regular levels of Morse flows},
author = {Bertolim, Maria Alice and Rezende, Ketty Abaroa de and Manzoli Neto, Oziride and Vago, Gioia Maria},
year = {2011},
doi = {10.1016/j.topol.2011.01.021},
journal   = {Topology and its Applications}
}