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A counter-example of P. S. Das's paper

Mohammad Mehdi Zahedi | M. M. Zahedi | Mashaallah Mashinchi | M. Mashinchi

[1] Prabir Bhattacharya,et al. Fuzzy normal subgroups and fuzzy cosets , 1984, Inf. Sci..

[2] N. P. Mukherjee,et al. Fuzzy relations and fuzzy groups , 1985, Inf. Sci..

[3] P. Das. Fuzzy groups and level subgroups , 1981 .