@article{03684036,
title = {Wronskians and subspaces of certain fourth order differential equations.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {3},
year = {1980},
pages = {275-292},
doi = {10.1155/S0161171280000208},
zbl = {0438.34024},
language = {en},
url = {http://dml.mathdoc.fr/item/03684036}
}
Etgen, G.J.; Taylor jun., W.E. Wronskians and subspaces of certain fourth order differential equations.. International Journal of Mathematics and Mathematical Sciences, Tome 3 (1980) pp. 275-292. doi : 10.1155/S0161171280000208. http://gdmltest.u-ga.fr/item/03684036/