@article{hochstadt:1963:hi,
    author = {Hochstadt, Harry},
     title = {Estimates of the stability intervals for {H}ill's equation},
   journal = {Proc. Amer. Math. Soc.},
    volume = {14},
      year = {1963},
    number = {6},
     pages = {930–932},
   mrclass = {34.51},
  mrnumber = {MR0156023 (27 \#5956)},
mrreviewer = {P. Ungar},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0002-9939%28196312%2914%3A6%3C930%3AEOTSIF%3E2.0.CO%3B2-X}},
     zblno = {0122.09202}}