@article{MZ_1988__200_3_174020,
     author = {Nakao Hayashi and Tohru Ozawa},
     title = {Time {Decay} for {Some} {Schr\"odinger} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {467--484},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {1988},
     zbl = {0646.35020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__200_3_174020/}
}