[1]N. Ajmal, The lattice of fuzzy normal subgroups is modular, Inform. Sci., 83 (1995) 199-209.
[2]N. Ajmal, Fuzzy groups with sup property, Inform. Sci., 93 (1996), 247-264.
[3]N. Ajmal and K. V. Thomas, The lattice of fuzzy subgroups and fuzzy normal subgroups Inform. Sci.,76 (1994), 1-11.
[4]N. Ajmal and K.V. Thomas, The lattice of fuzzy ideals of a ring R, Fuzzy Sets and Systems,74 (1995), 371-379.
[5]N. Ajmal and K. V. Thomas, A complete study of the lattices of fuzzy congruences and
fuzzy normal subgroups, Inform. Sci., 82 (1995), 198-218.
[6]P. S. Das, Fuzzy subgroups and level subgroups, J. Math. Anal. Appl., 84 (1981), 264-269.
[7]T. Head, A metatheorem for deriving fuzzy theorems from crisp versions, Fuzzy Sets and
Systems,73 (1995), 349-358.
[8]R. Kumar, Non distributivity of the lattice of fuzzy ideals of a ring R, Fuzzy Sets and
Systems,97 ( 1998), 393-394.
[9]Majumdar and Sultana, The lattice of fuzzy ideals of a ring R, Fuzzy Setsand Systems, 81
(1996), 271-273.
[10]A. Rosenfeld, Fuzzy subgroups, J. Math. Anal. Appl., 35(1971), 512-517.
[11]Q. Zhang and Meng , On the lattice of fuzzy ideals of a ring, Fuzzy Sets and Systems,
112(2000), 349-353.
[12]Q. Zhang, The lattice of fuzzy (left, right) ideals of a ring is modular, Fuzzy Sets and Systems,
125 (2002), 209-214.