@article{2246,
author = {Sternberg, Robert L.},
title = {Applications of the theory of systems of differential equations to vibrating beams},
journal = {Portugaliae mathematica},
volume = {13},
year = {1954},
pages = {111-120},
zbl = {0057.31902},
mrnumber = {0068699},
language = {en},
url = {http://dml.mathdoc.fr/item/2246}
}
Sternberg, Robert L. Applications of the theory of systems of differential equations to vibrating beams. Portugaliae mathematica, Tome 13 (1954) pp. 111-120. http://gdmltest.u-ga.fr/item/2246/