Liu Y, Z Lin and Z Shen (2005). “Study on Green Product Evaluation Based on Modified Data Envelopment Analysis Model.” China Mechanical Engineering 16(20): 1809-1813.
Liu Y, Z Lin and Z Shen (2005). “Study on Green Product Evaluation Based on Modified Data Envelopment Analysis Model.” China Mechanical Engineering 16(20): 1809-1813.