Geodesic
Simple bases and the number of functions in certain classes introduced by Post
Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 105-114.

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An investigation of the asymptotic behavior of the logarithm of the number of simple bases and the number of functions of $n$ variables in Post's classes $F_i^\mu$ ($i=1, 4, 5, 8; \mu\geqslant2$). 
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     author = {I. M. Sheinbergas},
     title = {Simple bases and the number of functions in certain classes introduced by {Post}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {105--114},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a11/}
}
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I. M. Sheinbergas. Simple bases and the number of functions in certain classes introduced by Post. Matematičeskie zametki, Tome 8 (1970) no. 1, pp. 105-114. http://geodesic.mathdoc.fr/item/MZM_1970_8_1_a11/