@article{JOLT_2004_14_2_a5,
     author = {D. D. Pervouchine},
     title = {Hierarchy of {Closures} of {Matrix} {Pencils

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     journal = {Journal of Lie Theory},
     pages = {443--479},
     year = {2004},
     volume = {14},
     number = {2},
     zbl = {1061.15012},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2004_14_2_a5/}
}