4) IMAI N. 1996 compilation of analytical data on nine GSJ Geochemical Reference Samples, "Sedimentary Rock Series". Geostandard Newsletter. (1996) vol.20, p.165-216.
5) IMAI N. 1998 compilation of analytical data for five GSJ Geochemical Reference Samples : the "Instrumental Analysis Series". Geostandard Newsletter. (1999) vol.23, p.223-250.