@article{daymond:1955:ep,
    author = {Daymond, S. D.},
     title = {The principal frequencies of vibrating systems with elliptic
              boundaries},
   journal = {Quart. J. Mech. Appl. Math.},
    volume = {8},
      year = {1955},
    number = {3},
     pages = {361–372},
   mrclass = {65.0X},
  mrnumber = {MR0075686 (17,792c)},
mrreviewer = {M. A. Hyman},
       doi = {10.1093/qjmam/8.3.361},
     zblno = {0064.37702}}