no. 2
A partially persistent data structure for the set-union problem
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 2, pp. 189-202 
@article{ITA_1990__24_2_189_0,
     author = {Gaibisso, C. and Gambosi, G. and Talamo, M.},
     title = {A partially persistent data structure for the set-union problem},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {189--202},
     year = {1990},
     publisher = {EDP Sciences},
     volume = {24},
     number = {2},
     mrnumber = {1073533},
     zbl = {0701.68021},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1990__24_2_189_0/}
}
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Gaibisso, C.; Gambosi, G.; Talamo, M. A partially persistent data structure for the set-union problem. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 24 (1990) no. 2, pp. 189-202. https://www.numdam.org/item/ITA_1990__24_2_189_0/

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