@article{article2e05eb99,
title   = {Structurally stable configurations of lines of mean curvature and umbilic points on surfaces immersed},
author = {Garcia, Ronaldo Alves and Sotomayor, Jorge},
year = {2001},
doi = {10.5565/PUBLMAT_45201_08},
journal   = {Publicacions Matematiques}
}