@book {Regis2012, title = {{G2Sd, Grain-size statistics and description of sediment}}, volume = {package ve}, year = {2012}, publisher = {R-project}, organization = {R-project}, address = {Vienna, Austria}, url = {http://cran.r-project.org/web/packages/G2Sd/index.html}, author = {R{\'e}gis, Gallon and J{\'e}r{\^o}me Fournier} }