no. 1
The relation of two patterns with comparable languages patterns
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 1, pp. 45-57. 
@article{ITA_1989__23_1_45_0,
     author = {Fil\'e, Gilberto},
     title = {The relation of two patterns with comparable languages patterns},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {45--57},
     publisher = {EDP-Sciences},
     volume = {23},
     number = {1},
     year = {1989},
     mrnumber = {990067},
     zbl = {0665.68060},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1989__23_1_45_0/}
}
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Filé, Gilberto. The relation of two patterns with comparable languages patterns. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 1, pp. 45-57. http://www.numdam.org/item/ITA_1989__23_1_45_0/

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2. Ch. Codognet, Personal Communication, 1986.

3. T. Shinohara, Polynomial Time Inference of Pattern Languages and its Applications, Proc. of the 7-th IBM Symp. on Math. Found. of Comp. Sci., 1982.