Geodesic
Upper bounds on finite-automaton complexity for generalized regular expressions in a~one-letter alphabet
Diskretnaya Matematika, Tome 1 (1989) no. 4, pp. 12-16.

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We compare the complexity of specifying a regular event by a finite automaton and a generalized regular expression. The measure of complexity of the automaton is the number of its states $G$, and the measure of complexity of the generalized regular expression is its refined length $\alpha$. We show that for generalized (having operations of set-theoretic complementation and intersection) regular expressions in a one-letter alphabet, $G\leqslant 3^\alpha$. 
@article{DM_1989_1_4_a1,
     author = {Z. R. Dang},
     title = {Upper bounds on finite-automaton complexity for generalized regular expressions in a~one-letter alphabet},
     journal = {Diskretnaya Matematika},
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     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1989_1_4_a1/}
}
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Z. R. Dang. Upper bounds on finite-automaton complexity for generalized regular expressions in a~one-letter alphabet. Diskretnaya Matematika, Tome 1 (1989) no. 4, pp. 12-16. http://geodesic.mathdoc.fr/item/DM_1989_1_4_a1/