TY - JOUR AU - Greibach, S. A. TI - One counter languages and the chevron operation JO - RAIRO. Informatique théorique PY - 1979 DA - 1979/// SP - 189 EP - 194 VL - 13 IS - 2 PB - EDP-Sciences UR - http://www.numdam.org/item/ITA_1979__13_2_189_0/ UR - https://zbmath.org/?q=an%3A0441.68081 UR - https://www.ams.org/mathscinet-getitem?mr=543940 LA - en ID - ITA_1979__13_2_189_0 ER -