1. P. S. Alexandroff and B. A. Pasynkov, Introduction to Dimension Theory (in Russian), Moskva 1973.
2. E. Čech, Problem 53, Colloq. Math. 1 (1948), p. 332.
3. B. H. Dowker, Local dimension of normal spaces, Quart. J. Math. Oxford 6 (1955), pp. 101–120.
4. R. Engelking, General Topology, Warszawa 1977.
5. V. V. Fedorčuk, Compatibility of some theorems of the general topology with axioms of the theory of sets (in Russian), DAN SSSR 220 (1975), pp. 786–788.