@article{00969303, title = {Almost-orthonormal vector systems.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {37}, year = {1996}, pages = {367-381}, zbl = {0874.15001}, language = {en}, url = {http://dml.mathdoc.fr/item/00969303} }
Haase, Dietrich; Stachel, Hellmuth. Almost-orthonormal vector systems.. Beiträge zur Algebra und Geometrie, Tome 37 (1996) pp. 367-381. http://gdmltest.u-ga.fr/item/00969303/