@misc
{TN_libero_mab2,
author = {
Travis, Curtis C.
},
title = {
Comparison of Eigenvalues for Linear Differential Equations of Order 2n
},
publisher = {The American Mathematical Society},
isbn = {0002-9947},
year = {1973},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}