no. 3
On the Ehrenfeucht conjecture for DOL languages
RAIRO. Informatique théorique, Tome 17 (1983) no. 3, pp. 205-230. 
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     author = {Culik, Karel Ii and Karhum\"aki, Juhani},
     title = {On the {Ehrenfeucht} conjecture for {DOL} languages},
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     pages = {205--230},
     publisher = {EDP-Sciences},
     volume = {17},
     number = {3},
     year = {1983},
     mrnumber = {743886},
     zbl = {0544.68050},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1983__17_3_205_0/}
}
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Culik, Karel Ii; Karhumäki, Juhani. On the Ehrenfeucht conjecture for DOL languages. RAIRO. Informatique théorique, Tome 17 (1983) no. 3, pp. 205-230. http://archive.numdam.org/item/ITA_1983__17_3_205_0/

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