@article{1183538663,
author = {Lakshmikantham, V.},
title = {Review: B. M. Levitan and I. S. Sargsjan, Introduction to spectral theory: Selfadjoint ordinary differential operators},
journal = {Bull. Amer. Math. Soc.},
volume = {83},
number = {6},
year = {1977},
pages = { 188-189},
language = {en},
url = {http://dml.mathdoc.fr/item/1183538663}
}
Lakshmikantham, V. Review: B. M. Levitan and I. S. Sargsjan, Introduction to spectral theory: Selfadjoint ordinary differential operators. Bull. Amer. Math. Soc., Tome 83 (1977) no. 6, pp. 188-189. http://gdmltest.u-ga.fr/item/1183538663/