%0 Journal Article %A Datko, R. %T Integrals of the Differential Equations ẍ + f ( s ) x = 0 %J Canadian mathematical bulletin %D 1967 %P 191-196 %V 10 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-017-2/ %R 10.4153/CMB-1967-017-2 %F 10_4153_CMB_1967_017_2