@article{CMH_1977__52_139687,
     author = {Daniel Asimov},
     title = {Flaccidity of geometric index for nonsingular vector fields.},
     journal = {Commentarii mathematici Helvetici},
     pages = {161--176},
     publisher = {mathdoc},
     volume = {52},
     year = {1977},
     zbl = {0366.58011},
     url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139687/}
}