http://dcherukhin.i2p/research/research.htm
(статья: pdf ;
рукопись: ps.gz , tex.tgz ) On circuits of functional elements of finite depth of branching //
Discrete Mathematics and Applications. 16(6): 577-587 (2006) [links: mathnet , Zbl pre05207877 , ams , doi ] Abstract: We introduce the notion of the depth of branching of a
circuit of functional elements and consider classes of circuits of branching
depth bounded by a constant.