1. R. Artico, G. Moresco, Fuzzy proximities according with Lowen fuzzy uniformities, Fuzzy Sets and Systems 21 (1987), 85–98.
2. G. Birkhoff, Lattice Theory, Amer. Math. Soc. Colloquium Publication XXXV, 3rd ed., American Mathematical Society (Providence, RI ), 1967.
3. M. Burgin, A. Sostak, Towards the theory of continuity defect and continuity measure for mappings of metric spaces, Acta Univ. Latv. 576 (1992), 45–62.
4. M. Burgin, A. Sostak, Fuzzification of the theory of continuous functions, Fuzzy Sets and Systems 62 (1994), 71–81.
5. C. L. Chang, Fuzzy topological spaces, J. Math. Anal. Appl., 24 (1968), pp. 182–190.