Jahanshahloo GR, M Sanei, F Hosseinzadeh Lotfi and N Shoja (2004). “Using the Gradient Line for Ranking DMUs in DEA.” Appl Math Comput 151(1): 209-219.
Jahanshahloo GR, M Sanei, F Hosseinzadeh Lotfi and N Shoja (2004). “Using the Gradient Line for Ranking DMUs in DEA.” Appl Math Comput 151(1): 209-219.