d’Atri, Gianfranco Improved lower bounds to the travelling salesman problem. (English) Zbl 0399.90094 RAIRO, Rech. Opér. 12, 369-382 (1978). Page: Show Scanned Page MSC: 90C35 Programming involving graphs or networks PDFBibTeX XMLCite \textit{G. d'Atri}, RAIRO, Rech. Opér. 12, 369--382 (1978; Zbl 0399.90094) Full Text: DOI EuDML