@article{10_5427_jsing_2020_22c,
     author = {Jorge Luiz Deolindo-Silva},
     title = {On the characteristic curves on a surface in {R^4}},
     journal = {Journal of Singularities},
     pages = {28--39},
     publisher = {mathdoc},
     volume = {22},
     year = {2020},
     doi = {10.5427/jsing.2020.22c},
     url = {http://geodesic.mathdoc.fr/articles/10.5427/jsing.2020.22c/}
}