no. 3
Improved lower bounds on the approximability of the traveling salesman problem
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 3, pp. 213-255. 
@article{ITA_2000__34_3_213_0,
     author = {B\"ockenhauer, Hans-Joachim and Seibert, Sebastian},
     title = {Improved lower bounds on the approximability of the traveling salesman problem},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {213--255},
     publisher = {EDP-Sciences},
     volume = {34},
     number = {3},
     year = {2000},
     mrnumber = {1796269},
     zbl = {0971.68075},
     language = {en},
     url = {http://www.numdam.org/item/ITA_2000__34_3_213_0/}
}
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Böckenhauer, Hans-Joachim; Seibert, Sebastian. Improved lower bounds on the approximability of the traveling salesman problem. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 34 (2000) no. 3, pp. 213-255. http://www.numdam.org/item/ITA_2000__34_3_213_0/

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