@article{ARM_1966_2_2_a1,
     author = {Neuman, Franti\v{s}ek},
     title = {Note on the second phase of the differential equation $y''=q(t)y$},
     journal = {Archivum mathematicum},
     pages = {57--62},
     year = {1966},
     volume = {2},
     number = {2},
     mrnumber = {0203127},
     zbl = {0217.40201},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1966_2_2_a1/}
}