@article{kalnins:1976:tgo,
    author = {Kalnins, E. G. and Miller, Jr., W. and Winternitz, P.},
     title = {The group ${\rm {O}}(4)$, separation of variables and the
              hydrogen atom},
   journal = {SIAM J. Appl. Math.},
    volume = {30},
      year = {1976},
    number = {4},
     pages = {630–664},
   mrclass = {81.22},
  mrnumber = {MR0411399 (53 \#15135)},
mrreviewer = {Anthony J. Bracken},
       doi = {10.1137/0130058},
     zblno = {0335.35002}}