no. 4
Improved lower bounds to the travelling salesman problem
RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 4, pp. 369-382 
@article{RO_1978__12_4_369_0,
     author = {d'Atri, Gianfranco},
     title = {Improved lower bounds to the travelling salesman problem},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {369--382},
     year = {1978},
     publisher = {EDP Sciences},
     volume = {12},
     number = {4},
     mrnumber = {516515},
     zbl = {0399.90094},
     language = {en},
     url = {https://www.numdam.org/item/RO_1978__12_4_369_0/}
}
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d'Atri, Gianfranco. Improved lower bounds to the travelling salesman problem. RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 4, pp. 369-382. https://www.numdam.org/item/RO_1978__12_4_369_0/

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