no. 2
On locating a single path-like facility in a general graph
RAIRO - Operations Research - Recherche Opérationnelle, Tome 31 (1997) no. 2, pp. 107-115. 
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     author = {Punnen, Abraham P.},
     title = {On locating a single path-like facility in a general graph},
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     pages = {107--115},
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     volume = {31},
     number = {2},
     year = {1997},
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     url = {http://www.numdam.org/item/RO_1997__31_2_107_0/}
}
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Punnen, Abraham P. On locating a single path-like facility in a general graph. RAIRO - Operations Research - Recherche Opérationnelle, Tome 31 (1997) no. 2, pp. 107-115. http://www.numdam.org/item/RO_1997__31_2_107_0/

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