no. 1
Extended primitive recursive functions
RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 73-84. 
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     author = {Mentrasti, P. and Protasi, M.},
     title = {Extended primitive recursive functions},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {73--84},
     publisher = {EDP-Sciences},
     volume = {16},
     number = {1},
     year = {1982},
     mrnumber = {677656},
     zbl = {0498.03024},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1982__16_1_73_0/}
}
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Mentrasti, P.; Protasi, M. Extended primitive recursive functions. RAIRO. Informatique théorique, Tome 16 (1982) no. 1, pp. 73-84. http://www.numdam.org/item/ITA_1982__16_1_73_0/

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3. G. Germano and A. Maggiolo-Schettini, Sequence-to-Sequence Recursiveness, Inf. Proc. Lett., Vol. 4, No. 1, 1975, pp. 1-6. | MR | Zbl

4. G. Jacopini and P. Mentrasti, Funzioni ricorsive di sequenza, Pub. LA.C., Serie III, No. 104, 1975, pp. 5-39. | Zbl

5. P. Mentrasti, Sulle classi di funzioni elementari ed elementari inferiori in una variabile, Rend. Mat., (1), Vol. 9, Serie VI, 1976, pp. 37-56. | MR | Zbl