[Wien] about Birch-Murnaghan

[LinYan Li]

Dear Stefaan,
  In the mailing list, "A derivation and physical background of the Murnaghan and Birch-Murnaghan equations (including references) can be found http://en.wikipedia.org/wiki/Birch-Murnaghan_equation_of_state"

but I can not open this link, I want to know the derivation of Birch-Murnaghan_equation_of_state, can you help me?
Thank you very much!

yours,
Linyan Li