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• Simon, Petr: On local merotopic character. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 2, pp. 249-270
• Tomášek, Stanislav: On a theorem of M. Katětov. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 7 (1966), issue 1, pp. 105-108