@article{SIAM J. Sci. Comput. 21, 4, 1321--1336,
  author = "D. Kay and D. J. Silvester",
  journal = "SIAM J. Sci. Comput.",
  number = "4",
  pages = "1321--1336",
  title = "A posteriori error estimation for stabilized mixed approximations of the Stokes equations",
  volume = "21",
  year = "1999",
}