@article{GDZPPN002197820,
title = {Grassmannian subvarieties arising in the spectral theory of ordinary differential operators.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {316},
year = {1980},
pages = {32-43},
zbl = {0454.34017},
url = {http://dml.mathdoc.fr/item/GDZPPN002197820}
}
Varley, Robert; Carlson, Robert. Grassmannian subvarieties arising in the spectral theory of ordinary differential operators.. Journal für die reine und angewandte Mathematik, Tome 316 (1980) pp. 32-43. http://gdmltest.u-ga.fr/item/GDZPPN002197820/