@article{watson:1935:sel,
    author = {Watson, G. N.},
     title = {The surface of an ellipsoid},
   journal = {Quart. J. Math., Oxford Ser.},
    volume = {6},
      year = {1935},
     pages = {280–287},
       doi = {10.1093/qmath/os-6.1.280},
     zblno = {0013.05802}}