no. 1
Reducibility as a tool to extend the power of approximation algorithms the minimization of boolean expressions
RAIRO. Informatique théorique, Tome 11 (1977) no. 1, pp. 75-82 
@article{ITA_1977__11_1_75_0,
     author = {Aiello, A. and Burattini, E. and Massarotti, A.},
     title = {Reducibility as a tool to extend the power of approximation algorithms the minimization of boolean expressions},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {75--82},
     year = {1977},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {1},
     mrnumber = {478742},
     zbl = {0366.94048},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1977__11_1_75_0/}
}
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Aiello, A.; Burattini, E.; Massarotti, A. Reducibility as a tool to extend the power of approximation algorithms the minimization of boolean expressions. RAIRO. Informatique théorique, Tome 11 (1977) no. 1, pp. 75-82. https://www.numdam.org/item/ITA_1977__11_1_75_0/

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