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Öztopal A., Şahin A.D., Akgün N, Şen Z, On the regional wind energy potential of Turkey, Energy, 25(2), 189-200, 2000.
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Şen Z., Öztopal A., Genetic algorithms for the classification and prediction of precipitation occurrence, Hydrological Sciences Journal, 46(2), 255-267, 2001.
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Şen Z., Öztopal A., Assessment of regional air pollution variability in Istanbul, Environmetrics 12 (5): 401-420 AUG 2001.