Juraj Hromkovic Juhani Karhumäki Arto Lepistö Comparing Descriptional and Computational Complexity of Infinite Words. 169-182 1994 conf/birthday/1994salomaa Results and Trends in Theoretical Computer Science db/conf/birthday/salomaa1994.html#HromkovicKL94 http://dx.doi.org/10.1007/3-540-58131-6_46