@article{GDZPPN002541580,
title = {Vector valued Chebechev systems},
journal = {Revista colombiana de matematicas},
volume = {23},
year = {1989},
pages = {25-34},
zbl = {0718.41034},
url = {http://dml.mathdoc.fr/item/GDZPPN002541580}
}
Al-Zamel, A.; Khalil, R. Vector valued Chebechev systems. Revista colombiana de matematicas, Tome 23 (1989) pp. 25-34. http://gdmltest.u-ga.fr/item/GDZPPN002541580/