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نذير اسماعيل قاسم م. 2013. Universal Cokriging of Non stationary Spatial Stochastic Process with an Application to Wells Data in Wana District North of Iraq. IRAQI JOURNAL OF STATISTICAL SCIENCES. 13, 3 (Dec. 2013), 217–238. DOI:https://doi.org/10.33899/iqjoss.2013.081236.