@article{EXMATH_1986_1986_1_a19,
     author = {Zaballa, Ion},
     title = {Existencia de matrices con entradas preescritas.},
     journal = {Extracta mathematicae},
     pages = {53-55},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1986_1986_1_a19/}
}