@article{JFAA_1999__5_4_59606,
     author = {P.E.T. Jorgensen and S. Pedersen},
     title = {Spectral {Pairs} in {Cartesian} {Coordinates.}},
     journal = {The journal of Fourier analysis and applications [[Elektronische Ressource]]},
     pages = {285--302},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1999},
     zbl = {1050.42016},
     url = {http://geodesic.mathdoc.fr/item/JFAA_1999__5_4_59606/}
}