@techreport{vanburen:1970:csw,
    author = {{Van Buren}, A. L. and Baier, R. V. and Hanish, S.},
     title = {A {F}ortran computer program for calculating the oblate spheroidal
              radial functions of the first and second kind and their
              first derivatives},
institution = {Naval Res.\ Lab.\, Washingtion, D. C.},
      type = {{NRL} Report No. 6959},
      year = {1970}}