%0 Journal Article %A Culik, Karel Ii %A Karhumäki, Juhani %T On the Ehrenfeucht conjecture for DOL languages %J RAIRO. Informatique théorique %D 1983 %P 205-230 %V 17 %N 3 %I EDP-Sciences %U http://www.numdam.org/item/ITA_1983__17_3_205_0/ %G en %F ITA_1983__17_3_205_0