@article{SORT_2003_2003_1_a3,
     author = {Nielsen, Soren Feodor},
     title = {An\'alisis de supervivencia con covarianzas groseramente observadas.},
     journal = {Sort},
     pages = {41-64},
     year = {2003},
     volume = {27},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SORT_2003_2003_1_a3/}
}