@article{AFM_2005_30_2_a10,
     author = {Per Sj\"olin},
     title = {Spherical harmonics and maximal estimates for the {Schr\"odinger} equation},
     journal = {Annales Fennici Mathematici},
     pages = {393--406},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2005_30_2_a10/}
}