@article{10_4153_CMB_1992_029_x,
     author = {Howard, Ralph and Reese, Margaret},
     title = {Characterization of {Eigenfunctions} by {Boundedness} {Conditions}},
     journal = {Canadian mathematical bulletin},
     pages = {204--213},
     year = {1992},
     volume = {35},
     number = {2},
     doi = {10.4153/CMB-1992-029-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-029-x/}
}