@article{MZ_1990__205_3_174190,
     author = {Albert Schneider and Frank Mantlik},
     title = {Note on the absolutely continuous spectrum of {Sturm-Liouville} operators.},
     journal = {Mathematische Zeitschrift},
     pages = {491--498},
     publisher = {mathdoc},
     volume = {205},
     number = {3},
     year = {1990},
     zbl = {0713.34030},
     url = {http://geodesic.mathdoc.fr/item/MZ_1990__205_3_174190/}
}