Investigaciones geográficas On-line version ISSN 2448-7279Print version ISSN 0188-4611
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GRADILLA HERNANDEZ, Luz and GONZALEZ GOMEZ, Ovidio.Identification of critical segments by vulnerability for freight transport on the paved road network of Mexico. Invest. Geog [online]. 2011, n.74, pp.48-57.
ISSN 2448-7279.