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We study a spectrum sharing scenario where multiple secondary systems coexist and interfere with each other. Unfair and inefficient situations may arise since negotiation is infeasible for competitive secondary users from dissimilar secondary systems. We use repeated games in microeconomic to construct cooperation due to lack of information exchange. Repeated games build reputations and apply punishments to achieve a desirable self-enforcing outcome. By playing a strategic game many times more efficient and fair Nash Equilibrium is acquired.