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@article{ARM_1974__10_2_a1, author = {R\'ab, Milo\v{s}}, title = {Asymptotic formulas for solutions of the equation $[p(t)y']'=q(t)y+r(t)$}, journal = {Archivum mathematicum}, pages = {79--85}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1974}, mrnumber = {0382795}, zbl = {0318.34062}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1974__10_2_a1/} }
Ráb, Miloš. Asymptotic formulas for solutions of the equation $[p(t)y']'=q(t)y+r(t)$. Archivum mathematicum, Tome 10 (1974) no. 2, pp. 79-85. http://geodesic.mathdoc.fr/item/ARM_1974__10_2_a1/