@article{ITA_1983__17_3_205_0,
     author = {Culik, Karel Ii and Karhum\"aki, Juhani},
     title = {On the {Ehrenfeucht} conjecture for {DOL} languages},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {205--230},
     publisher = {EDP-Sciences},
     volume = {17},
     number = {3},
     year = {1983},
     mrnumber = {743886},
     zbl = {0544.68050},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1983__17_3_205_0/}
}