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Ecoiomic planning research in developing and utilizing hilly and mountainous land at Nanfen township Ⅰ: Establishment of multiple objective programming model USE AND MANAGEMENT OF SOIL WATER AND NITROGEN RESOURCES Ⅲ The optimal management of soil water and nitrogen resources Order Degree Calculation and Optimization on Forestry Industrial Structure of Heilongjiang Province Based on Markov Quadratic Programming Model Using Gene-Expression Programming method and geographical location information to simulate evapotranspiration in Hunan and Hubei Provinces On watershed eco-economic system planning