Hosseinzadeh Lot, F, Noora, A. A., Nikoomaram, H., Alimardani, M., Modi, M. Usnig LR-Fuzzy Numbers Data to Measure the Eciency and the Malmquist Productivity Index
 in Data Envelopment Analysis , and Its 
 Application in Insurance Organizations. International Journal of Industrial Mathematics. 2009;1(1):55-68. doi: