@book{vanburen:1975:tas,
    author = {{Van Buren}, A. L. and King, B. J. and Baier, R. V. and Hanish, S.},
     title = {Tables of Angular Spheroidal Wave Functions, Vol.\ 1,  Prolate, $m=0$;
              Vol.\ 2, Oblate, m=0},
 publisher = {Naval Res.\ Lab.\ Reports},
   address = {Washington, D.C.},
      year = {1975}}