@article{ASNSP_1970_3_24_2_331_0,
     author = {Sj\"ostrand, Sigrid},
     title = {On the {Riesz} means of the solutions of the {Schr\"odinger} equation},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {331--348},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 24},
     number = {2},
     year = {1970},
     mrnumber = {270219},
     zbl = {0201.14901},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1970_3_24_2_331_0/}
}