@book{Langtangen-PSF-2008,
    title = {Python Scripting for Computational Science},
    year = {2008 },
  	author = {Hans Peter Langtangen},
    edition = {3rd},
    isbn = {978-3-540-73915-9},
    publisher = {Springer Verlag}
  }

  @misc{Hunter-PSC-2010,
  	url = {http://www.maths.lth.se/na/help/media/Practical_Scientific_Computing_with_Python.pdf},
    howpublished = {WWW page},
    year = {2010 },
    title = {Practical Scientific Computing in Python},
   author = {John D. Hunter and Fernando Perez}
  }