Farci A.M.G., Cabras F., Cappai G., Chessa L., Pillosu I., Tuveri G., Loviselli A., Atzeni E., Mathieu A., Usai P., Laconi R., Balestrieri A. Garau V.L., Tocco M., Casula D.

Biochemical and Clinical Aspects of Pteridines, Vol V; 193-202, 1987 Walter de Gruyter & C., Berlin- New Jork printed in Germany