no. 1
Worst case analysis of two heuristics for the set partitioning problem
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 21 (1987) no. 1, pp. 11-23 
@article{ITA_1987__21_1_11_0,
     author = {Marchetti Spaccamela, A. and Pelaggi, A.},
     title = {Worst case analysis of two heuristics for the set partitioning problem},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {11--23},
     year = {1987},
     publisher = {EDP Sciences},
     volume = {21},
     number = {1},
     mrnumber = {882867},
     zbl = {0635.68030},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1987__21_1_11_0/}
}
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Marchetti Spaccamela, A.; Pelaggi, A. Worst case analysis of two heuristics for the set partitioning problem. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 21 (1987) no. 1, pp. 11-23. https://www.numdam.org/item/ITA_1987__21_1_11_0/

[FM] M. Fischetti and S. Martello, Worst-Case Analysis of the Differencing Method for the Partition Problem, Internal Report University of Bologna, 1986. | MR

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[J] D. S. Johnson, Approximation Algorithms for Combinatorial Problem 2, Journal of Computer and System Sciences, Vol. 9, 1974, pp. 256-278. | MR

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