@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/