Advantages of Ultrametric Counter Automata. - Valdis Adamsons; Karlis Jerins; Rihards Krislauks; Marta Lapina; Andris Pakulis; Rusins Freivalds (SOFSEM (Student Research Forum Papers / Posters), 2015)

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