fuzzy $G_\delta$-neighbourhood; fuzzy $G_\delta$–$T_1$-ordered spaces; fuzzy $G_\delta$–$T_2$ ordered spaces
$G_\delta$-separation axioms are introduced in ordered fuzzy topological spaces and some of their basic properties are investigated besides establishing an analogue of Urysohn’s lemma.
 Sostak A. P.: On a fuzzy topological structure
. Suppl. Rend. Circ. Mat. Palermo 11 (1985), 89–103 MR 0897975
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