@article{EJDE_2007__2007__a31,
     author = {Sakata,  Mayumi},
     title = {Convergence of generalized eigenfunction expansions},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1156.47024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a31/}
}