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Литература
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| 1. |
E. Lehtonen, “Descending chains and antichains of the unary, linear, and monotone
subfunction relations”, Order, 23 (2006), 129–142    |
| 2. |
E. L. Post, The Two-valued Iterative Systems of Mathematical Logic, Princeton Univ. Press, Princeton, NJ, 1941 |
| 3. |
D. Skordev, “Maximal depths of Boolean functions”, Annuaire de l' Univ. de Sofia, Fac. de Math. et Inform., 96 (2004), 89–99 |
| 4. |
I. E. Zverovich, “Characterizations of closed classes of Boolean functions in terms of
forbidden subfunctions and Post classes”, Discrete Applied Mathematics, 149 (2005), 200–218 |
