[1] F. Rublík: Simultaneous channels decomposable into memoryless components I. Kybernetika 15 (1979), 4, 316-327. MR 0551575

[2] K. Winkelbauer: On discrete channels decomposable into memoryless components. Kybernetika 8 (1972), 114-132. MR 0339887 | Zbl 0256.94021

[3] K. Winkelbauer: Information channels with memoryless components. Transactions of the Seventh Prague Conference on Information Theory etc., Prague 1974.

[4] J. Wolfowitz: Coding Theorems of Information Theory. Springer 1964. MR 0176851 | Zbl 0132.39704