1. Wiese C, Cogoli-Greuter M, Weinreich R, Winterhalter KH (1992) J Neurochem (in press)
2. Wiese C, Cogoli-Greuter M, Argentini M, M�der T, Weinreich R, Winterhalter KH (submitted for publication)
3. Davankov VA (1980) Adv Chromatogr 18:139?195
4. Gil-Av E, Tishbee A, Hare PE (1980) J Am Chem Soc 102:5115?5117
5. Masia P, Nicoletti I, Sinibaldi M, Attanasio D, Messina A (1988) Anal Chim Acta 204:145?150