@article{1103040252,
author = {Reid, William T.},
title = {Principal solutions of non-oscillatory self-adjoint linear differential systems.},
journal = {Pacific J. Math.},
volume = {8},
number = {4},
year = {1958},
pages = { 147-169},
language = {en},
url = {http://dml.mathdoc.fr/item/1103040252}
}
Reid, William T. Principal solutions of non-oscillatory self-adjoint linear differential systems.. Pacific J. Math., Tome 8 (1958) no. 4, pp. 147-169. http://gdmltest.u-ga.fr/item/1103040252/