Meshchaninov, D. G. On closed classes of \(k\)-valued functions that preserve the first \(d\)-differences. (Russian) Zbl 1201.03011 Mat. Vopr. Kibern. 8, 219-230 (1999). MSC: 03B50 08C99 PDFBibTeX XMLCite \textit{D. G. Meshchaninov}, Mat. Vopr. Kibern. 8, 219--230 (1999; Zbl 1201.03011)
Meshchaninov, D. G. On the first \(d\)-differences of functions of \(k\)-valued logic. (Russian) Zbl 1201.03012 Mat. Vopr. Kibern. 7, 265-280 (1998). MSC: 03B50 PDFBibTeX XMLCite \textit{D. G. Meshchaninov}, Mat. Vopr. Kibern. 7, 265--280 (1998; Zbl 1201.03012)