@article{articledaf16abe,
title   = {On the Omori-Yau maximum principle in Riemannian submersions},
author = {Pacelli Bessa, G and Piccione, Paolo},
year = {2011},
doi = {10.11606/issn.2316-9028.v5i1p105-114},
journal   = {São Paulo Journal of Mathematical Sciences}
}