@article{CLTM_2003_2003_1_a13,
     author = {Minatta, A. and Piccinini, R. and Spreafico, M.},
     title = {Nota sobre los grupos de isotrop{\'\i}a de haces de dos planos sobre superficies cerradas.},
     journal = {Collectanea mathematica},
     pages = {283-291},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_2003_2003_1_a13/}
}