Production Economics: The Basic Theory of Production Optimisation: http://www.google.dk/books?hl=da&lr=&id=JXlOnpzEbRMC&oi=fnd&pg=PR6&dq=+Production+Economics:+The+Basic+Theory+of+Production+Optimisation&ots=kkVwunwHWo&sig=c_iVcHbLplDGnhoiiJS4EVZ21-M&redir_esc=y#v=onepage&q&f=false
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