A portable device for measuring displacements along rock fractures
GULLA' G., NICOLETTI P.G., SORRISO-VALVO. M., 1988, A portable device for measuring displacements along rock fractures,
5th International Symposium on Landslides, pp. 423–426, Lausanne, July 10-15, 1988,
URL: http://www.cnr.it/prodotto/i/313061
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