On DOL Synthesis Problem. - Matti Soittola (Automata, Languages, Development, 1975)

Remarks on DOL Growth Sequences. - Matti Soittola (RAIRO Theor. Informatics Appl., 1976)

Positive Rational Sequences. - Matti Soittola (Theor. Comput. Sci., 1976)

Automata-Theoretic Aspects of Formal Power Series. - Arto Salomaa; Matti Soittola (Springer, 1978)