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              Lujala P (2009) Deadly combat over natural resources gems, petroleum, drugs, and the severity of armed civil conflict. Journal of Conflict Resolution 531: 50-71.
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              Lujala, Päivi (2009): Deadly Combat over Natural Resources: Gems, Petroleum, Drugs, and the Sever- ity of Armed Civil Conflict. In: Journal of Conflict Resolution, 53 (1), 50-71.
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              Lujala, Päivi 2009: Deadly Combat over Natural Resources: Gems, Petroleum, Drugs, and the Severity of Armed Civil Conflict, in: Journal of Conflict Resolution, 53: 1, 50-71.
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