Carsten Damm Markus Holzer 0001 Klaus-Jörn Lange Parallel Complexity of Iterated Morphisms and the Arithmetic of Small Numbers. 227-235 1992 conf/mfcs/1992 MFCS db/conf/mfcs/mfcs92.html#DammHL92 https://doi.org/10.1007/3-540-55808-X_21