@article{shirts:1993:ces,
    author = {Shirts, R. B.},
     title = {\NOOP{A}The computation of eigenvalues and solutions of {M}athieu's
              differential equation for noninteger order},
   journal = {ACM Trans. Math. Software},
    volume = {19},
      year = {1993},
    number = {3},
     pages = {377–390},
      issn = {0098-3500},
       doi = {10.1145/155743.155796},
     zblno = {0892.65057}}