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MR ZblRovder, Jozef. Oscillatory properties of the fourth order linear differential equation. Mathematica slovaca, Tome 33 (1983) no. 4, pp. 371-379. http://geodesic.mathdoc.fr/item/MASLO_1983_33_4_a6/
@article{MASLO_1983_33_4_a6,
author = {Rovder, Jozef},
title = {Oscillatory properties of the fourth order linear differential equation},
journal = {Mathematica slovaca},
pages = {371--379},
year = {1983},
volume = {33},
number = {4},
mrnumber = {720507},
zbl = {0525.34027},
language = {en},
url = {http://geodesic.mathdoc.fr/item/MASLO_1983_33_4_a6/}
}
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