no. 2
On the minimum dummy-arc problem
RAIRO - Operations Research - Recherche Opérationnelle, Tome 27 (1993) no. 2, pp. 153-168 
@article{RO_1993__27_2_153_0,
     author = {Michael, David J. and Kamburowski, Jerzy},
     title = {On the minimum dummy-arc problem},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {153--168},
     year = {1993},
     publisher = {EDP Sciences},
     volume = {27},
     number = {2},
     mrnumber = {1222385},
     zbl = {0774.90047},
     language = {en},
     url = {https://www.numdam.org/item/RO_1993__27_2_153_0/}
}
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Michael, David J.; Kamburowski, Jerzy. On the minimum dummy-arc problem. RAIRO - Operations Research - Recherche Opérationnelle, Tome 27 (1993) no. 2, pp. 153-168. https://www.numdam.org/item/RO_1993__27_2_153_0/

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