Discrete dynamical systems with threshold functions of up to three variables

We propose a method for finding sources of discrete dynamical systems of the circulant type with a $q$-valued arbitrary function at the vertices. We find all the sources, all the fixed points and some cycles, as well as lengths of some maximal chains outside cycles for the systems with Boolean threshold functions of up to three variables at the vertices. Ill. 1, tab. 2, bibliogr. 15.