Systolic tree acceptors

Culik, Karel Ii; Salomaa, Arto; Wood, Derick

RAIRO. Informatique théorique, Volume 18 (1984) p. 53-69

On the Ehrenfeucht conjecture for DOL languages

Culik, Karel Ii; Karhumäki, Juhani

RAIRO. Informatique théorique, Volume 17 (1983) p. 205-230