참고문헌
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$H_v$ -subgroups and anti fuzzy$H_v$ -subgroups B. Davvaz -
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$H_v$ -rings and fuzzy$H_v$ -ideals B. Davvaz -
$8^{iem}v$ congres Math. Scandinaves Sur nue generalization de la notion de groupe F. Marty - J. Math. Anal. v.35 Fuzzy groups A. Rosenfeld
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