@article{ETNA_1999__9__a8,
     author = {Costa,  Cec{\'\i}lia and Ser\^odio,  Rog\'erio},
     title = {A footnote on quaternion block-tridiagonal systems},
     journal = {Electronic transactions on numerical analysis},
     pages = {53--55},
     year = {1999},
     volume = {9},
     zbl = {0952.65030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1999__9__a8/}
}