See section 7.2 Convexification by numbers in Salanié: Salanié, Bernard (2000). «7 Nonconvexities». Microeconomics of market failures (English translation of the (1998) French Microéconomie: Les défaillances du marché (Economica, Paris) ed.). Cambridge, Massachusetts: MIT Press. էջեր 107–125. ISBN978-0-262-19443-3.