Dyck<sub>1</sub>-Reductions of Context-free Languages.

Matthias Jantzen Manfred Kudlek Klaus-Jörn Lange Holger Petersen Dyck<sub>1</sub>-Reductions of Context-free Languages. 218-227 1987 conf/fct/1987 FCT db/conf/fct/fct87.html#JantzenKLP87 http://dx.doi.org/10.1007/3-540-18740-5_45