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F. Hosseinzadeh Lotfi, G. R. Jahanshahloo, R. Shahverdi, M. Rostamy-Malkhalifeh       Cost efficiency and cost Malmquist productivity index with interval data       Int. Math. Forum, Vol. 2, 2007, no. 9-12, 441-453       http://dx.doi.org/10.12988/imf.2007.07040
Copyright © 2007 F. Hosseinzadeh Lotfi, G. R. Jahanshahloo, R. Shahverdi and M. Rostamy-Malkhalifeh. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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