Geodesic
The minimization of a certain complexity function in the class of
Algebra i logika, Tome 7 (1968) no. 3, pp. 23-37 
A. Ya. Dikovsky; L. S. Modina. The minimization of a certain complexity function in the class of. Algebra i logika, Tome 7 (1968) no. 3, pp. 23-37. http://geodesic.mathdoc.fr/item/AL_1968_7_3_a2/
@article{AL_1968_7_3_a2,
     author = {A. Ya. Dikovsky and L. S. Modina},
     title = {The minimization of a certain complexity function in the class of},
     journal = {Algebra i logika},
     pages = {23--37},
     year = {1968},
     volume = {7},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1968_7_3_a2/}
}
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