1. The synthesis of folic acid, multiply labelled with stable isotopes, for bio-availability studies in human nutrition Peter Maunder,Paul M. Finglas,Anthony I. Mallet,Fred A. Mellon,M. Aaqib Razzaque,Brian Ridge,Liisa Vahteristo,Cornelia Witth?ft J. Chem. Soc. Perkin Trans. 1 1999 1311