@article{ Solr-acta12598, title = {Decompositions of automata and transition semigroups}, series = {Acta cybernetica}, author = {Petković Tatjana}, year = {1998}, url = {http://acta.bibl.u-szeged.hu/12598/1/cybernetica_013_numb_004_385-403.pdf} }