@article{02216469,
title = {A formula for angles between subspaces of inner product spaces.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {46},
year = {2005},
pages = {311-320},
zbl = {1087.15001},
language = {en},
url = {http://dml.mathdoc.fr/item/02216469}
}
Gunawan, Hendra; Neswan, Oki; Setya-Budhi, Wono. A formula for angles between subspaces of inner product spaces.. Beiträge zur Algebra und Geometrie, Tome 46 (2005) pp. 311-320. http://gdmltest.u-ga.fr/item/02216469/