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Guo, Kevin; Leung, Tim (2015). «Understanding the Tracking Errors of Commodity Leveraged ETFs». Commodities, Energy and Environmental Finance. Fields Institute Communications. Vol. 74. էջեր 39–63. doi:10.1007/978-1-4939-2733-3_2. ISBN978-1-4939-2732-6. SSRN2389411.