@article{EJDE_2005__2005__a93,
     author = {Volkmer,  Hans},
     title = {Eigenvalue problems of {Atkinson,} {Feller} and {Krein,} and their mutual relationship},
     journal = {Electronic journal of differential equations},
     year = {2005},
     volume = {2005},
     zbl = {1075.34027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a93/}
}