Experiments in Complexity of Probabilistic and Ultrametric Automata. - Kristine Cipola; Andris Pakulis; Rusins Freivalds (SOFSEM (Student Research Forum Papers / Posters), 2015)

Ultrametric Finite Automata and Their Capabilities. - Maksims Dimitrijevs; Kristine Cipola (Balt. J. Mod. Comput., 2016)