By Christofides N.   Badra H.O.   Sharaiha Y.M.   in Annals of Operations Research

ISSN:0254-5330|71|1|259-289

Springer Publishing Company ‎(1997)‎

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By Luk S.-h.   Woo M.-k.   Beasley J.E.   Christofides N.   in European Journal of Operational Research

ISSN:0377-2217|98|3|499-511

Elsevier‎(1997)‎

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