no. 2
Three generators for minimal writing-space computations
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 2, pp. 131-138 
@article{ITA_2000__34_2_131_0,
     author = {Burckel, Serge and Morillon, Marianne},
     title = {Three generators for minimal writing-space computations},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {131--138},
     year = {2000},
     publisher = {EDP Sciences},
     volume = {34},
     number = {2},
     mrnumber = {1774305},
     zbl = {0962.68127},
     language = {en},
     url = {https://www.numdam.org/item/ITA_2000__34_2_131_0/}
}
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Burckel, Serge; Morillon, Marianne. Three generators for minimal writing-space computations. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 2, pp. 131-138. https://www.numdam.org/item/ITA_2000__34_2_131_0/

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[2] S. Burckel, Closed Iterative Calculus. Theoret. Comput. Sci. 158 (1996) 371-378. | Zbl | MR

[3] S. Burckel and M. Morillon, Computing Without Copying (submitted).

[4] S. Piccard, Sur les fonctions définies dans les ensembles finis quelconques. Fund. Math. 24 (1935) 298-301. | JFM