1. A.V. Arkhangel’skiı̆, The spectrum of frequencies of a topological space and the product operation. Tr. Mosk. Mat. Obshch. 40, 171–206 (1979) (in Russian)
2. V.A. Chatyrko, On properties of subsets of [0, ω c] × I. Quest. Answers Gen. Topology 26, 97–104 (2008)
3. R. Engelking, Theory of Dimensions, Finite and Infinite (Heldermann Verlag, Lemgo, 1995)
4. J. Krzempek, Components and inductive dimensions of compact spaces. Czechoslovak Math. J. 60, 445–456 (2010)
5. A.C. Olson, Biquotient maps, countably bisequential spaces and related topics. Topology Appl. 4, 1–28 (1974)