@article{MZ_1989__202_1_174100,
     author = {J. Weidmann and T. Poerschke and G. Stolz},
     title = {Expansions in {Generalized} {Eigenfunctions} of {Selfadjoint} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {397--408},
     publisher = {mathdoc},
     volume = {202},
     number = {1},
     year = {1989},
     zbl = {0661.47021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1989__202_1_174100/}
}