@article{EXMATH_1998_1998_1_a22,
     author = {Lindeboom (Groenewald), L. and Raubenheimer, H.},
     title = {Nota sobre el espectro singular.},
     journal = {Extracta mathematicae},
     pages = {349-357},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1998_1998_1_a22/}
}