@article{RMI_1996_1996_1_a9,
     author = {Fefferman, Charles L. and Seco, Luis A.},
     title = {El esp{\'\i}n del estado fundamental de un \'atomo.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {19-36},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_1996_1996_1_a9/}
}