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@article{MS2_1994__74_1_167299, author = {Shengjian Wu}, title = {On the {Location} of {Zeros} of {Solutions} of f'' + {A(z)f} = 0 where {A(z)} is {Entire.}}, journal = {Mathematica Scandinavica}, pages = {293--312}, publisher = {mathdoc}, volume = {74}, number = {1}, year = {1994}, zbl = {0827.34003}, url = {http://geodesic.mathdoc.fr/item/MS2_1994__74_1_167299/} }
Shengjian Wu. On the Location of Zeros of Solutions of f'' + A(z)f = 0 where A(z) is Entire.. Mathematica Scandinavica, Tome 74 (1994) no. 1, pp. 293-312. http://geodesic.mathdoc.fr/item/MS2_1994__74_1_167299/