@article{MAN_1977__225_162937,
     author = {J.B. Carrell and D.L Liebermann},
     title = {Vector {Fields} and {Chern} {Numbers.}},
     journal = {Mathematische Annalen},
     pages = {263--274},
     publisher = {mathdoc},
     volume = {225},
     year = {1977},
     zbl = {0365.32020},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__225_162937/}
}