@article{article4eed17cb,
title   = {Poincaré index and the volume functional of unit vector fields on punctured spheres},
author = {Brito, Fabiano Gustavo Braga and Gomes, André de Oliveira and Gonçalves, Icaro},
year = {2020},
doi = {10.1007/s00229-019-01107-y},
journal   = {manuscripta mathematica}
}