no. 1
On languages satisfying “interchange lemma”
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 27 (1993) no. 1, pp. 71-79. 
@article{ITA_1993__27_1_71_0,
     author = {Mitrana, Victor},
     title = {On languages satisfying {\textquotedblleft}interchange lemma{\textquotedblright}},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {71--79},
     publisher = {EDP-Sciences},
     volume = {27},
     number = {1},
     year = {1993},
     mrnumber = {1213422},
     zbl = {0770.68083},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1993__27_1_71_0/}
}
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Mitrana, Victor. On languages satisfying “interchange lemma”. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 27 (1993) no. 1, pp. 71-79. http://archive.numdam.org/item/ITA_1993__27_1_71_0/

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