1. [B] Blefko R.: Some classes of E-compactness, Austr. Math. J. (1972), 492–500.
2. [Č] Čech E: Topological spaces, Academia Prague 1966 (revised edition by M. Katětov, Z. Frolík)
3. [F1] Frolík Z.: Basic refinements of uniform spaces. Topology Conf. Pittsburgh 1972, Lecture Notes in Math. 378 (1974, 140–158.
4. [F2] Frolík Z.: Three uniformities associated with uniformly continuous functions, Symposia Math.
5. [F3] Frolík z.: Interplay of measurable and uniform spaces, Top. and its Appl. Budva 1972 (Beograd 1973). 98–101.