@article{JRAM_1962__211_150545,
     author = {H.J.W. M\"uller},
     title = {Asymtotic {Expansions} of {Oblate} {Spheroidal} {Wave} {Functions} and their {Characteristic} {Numbers.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {33--47},
     publisher = {mathdoc},
     volume = {211},
     year = {1962},
     zbl = {0129.28501},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1962__211_150545/}
}