@article{JRAM_1963__212_150566,
     author = {Harald J.W. M\"uller},
     title = {Asymptotic {Expansions} of {Prolate} {Spheriodial} {Wave} {Functions} and their {Characteristic} {Numbers.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {26--48},
     publisher = {mathdoc},
     volume = {212},
     year = {1963},
     zbl = {0113.28002},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1963__212_150566/}
}