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Algunaibet, Ibrahim; Matar, Walid (2018). The responsiveness of fuel demand to gasoline price change in passenger transport: a case study of Saudi Arabia. Energy Efficiency. 11 (6): 1341—1358. doi:10.1007/s12053-018-9628-6. S2CID157328882.
Havranek, Tomas; Irsova, Zuzana; Zeynalova, Olesia (2018). Tuition Fees and University Enrolment: A Meta‐Regression Analysis. Oxford Bulletin of Economics and Statistics. 80 (6): 1145—1184. doi:10.1111/obes.12240. S2CID158193395.