Publications with shared reference: Further Conventions for NMR Shielding and Chemical Shifts (IUPAC Recommendations 2008)Copyright IUPAC (2008). Reprinted with permission from Pure Appl. Chem., 2008, 80, 59-84, which can be freely downloaded from www.iupac.org/publications/pac/80/1/0059, provided IUPAC copyright is acknowledged in any use. Membership of the relevant IUPAC Committee is listed therein.