@article{EJDE_2006__2006__a28,
     author = {Umeda, Tomio},
     title = {Generalized eigenfunctions of relativistic {Schr\"odinger} operators. {I}},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2006},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a28/}
}