@article{kaylungu,
  title = "A block preconditioner for high order mixed finite element approximations to the Navier-Stokes equations",
  author = "D. Kay and E. Lungu",
  year = "2006",
  journal = "SIAM J. Sci. Comp.",
  number = "6",
  pages = "1867--1880",
  volume = "27",
  doi = "10.1137/040609045",
}