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N.Subramanian and  U.K.Misra,  A New Class χ2 (M, A,) of the Double Difference Sequences of Fuzzy Numbers.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2009, vol. 35(11). 954 - 958[viewed 17 November 2017]. Available from: http://waset.org/publications/8161.