Husson, Dorothee; Galbrun, Bruno; Thibault, Nicolas; Gardin, Silvia; Huret, Emilia; Coccioni, Rodolfo (2012): Astronomical duration of polarity Chron C31r (lower Maastrichtian); cyclostratigraphy of ODP Site 762 (Indian Ocean) and the Contessa highway section (Gubbio, Italy). Cambridge University Press, London, United Kingdom, Geological Magazine, 149 (2), 345-351, georefid:2012-030421