@article{Mihalache_Salomaa_1996, title={Growth functions and length sets of replicating systems}, volume={12}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3459}, number={3}, journal={Acta Cybernetica}, author={Mihalache, Valeria and Salomaa, Arto}, year={1996}, month={Jan.}, pages={235-247} }