@article{02124388,
title = {Hierarchy of closures of matrix pencils.},
journal = {Journal of Lie Theory},
volume = {14},
year = {2004},
pages = {443-479},
zbl = {1061.15012},
language = {en},
url = {http://dml.mathdoc.fr/item/02124388}
}
Pervouchine, Dmitri D. Hierarchy of closures of matrix pencils.. Journal of Lie Theory, Tome 14 (2004) pp. 443-479. http://gdmltest.u-ga.fr/item/02124388/