On cardinality of some subclasses of monotone functions
D. V. Khovratovich

References
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2.	Alekseev V. B., “O chisle monotonnykh $k$-znachnykh funktsii”, Problemy kibernetiki, 28 (1974), 5–24
3.	Kleitmen D., “O probleme Dedekinda: chislo monotonnykh bulevykh funktsii”, Kibern. sb., 7 (1970), 43–52