@article{03756896, title = {Qualitative properties of solutions of certain fourth order linear differential equations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {4}, year = {1981}, pages = {763-774}, doi = {10.1155/S0161171281000598}, zbl = {0482.34021}, language = {en}, url = {http://dml.mathdoc.fr/item/03756896} }
Taylor, W.E.jun. Qualitative properties of solutions of certain fourth order linear differential equations.. International Journal of Mathematics and Mathematical Sciences, Tome 4 (1981) pp. 763-774. doi : 10.1155/S0161171281000598. http://gdmltest.u-ga.fr/item/03756896/