no. 2
Classes of languages proof against regular pumping
RAIRO. Informatique théorique, Tome 14 (1980) no. 2, pp. 169-180. 
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     author = {Sommerhalder, R.},
     title = {Classes of languages proof against regular pumping},
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     pages = {169--180},
     publisher = {EDP-Sciences},
     volume = {14},
     number = {2},
     year = {1980},
     mrnumber = {581675},
     zbl = {0449.68035},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1980__14_2_169_0/}
}
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Sommerhalder, R. Classes of languages proof against regular pumping. RAIRO. Informatique théorique, Tome 14 (1980) no. 2, pp. 169-180. http://archive.numdam.org/item/ITA_1980__14_2_169_0/

1. L. Boasson, Un critère de rationnalité des langages algébriques. In M. NIVAT, Ed., Automata, Languages and Programming, 1972, pp. 359-365. | MR | Zbl

2. S. Horvàth, The Family of Languages Satisfying Bar-Hillel's Lemma, R.A.I.R.O., Informatique Theorique, Vol. 12, No. 3, 1978, pp. 193-199. | Numdam | MR | Zbl

3. J. Jaffe, A Necessary and Sufficient Pumping Lemma for Regular Languages, S.I.G.A.C.T. News summer, 1978, pp. 48-49. | Zbl

4. J. Van Leeuwen, Private communication, 1978.