Here is a link. When you show a Fermi boundary, it is important to also show the extent of the (1st) Brillouin zone. The (1st) Brillouin zone is a domain in k-space in which each state can be found exactly once. Going beyond that would lead to encompassing some states more than once (over counting). The point of the Fermi boundary is to be able to specify which states are occupied (and which states are not occupied).
https://drive.google.com/file/d/0B_GIlXrjJVn4R09ISFh6Nl92NU0/view?usp=sharing
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