1. A new method for fluorometric measurement of proline in grapes and wines;Yokotsuka;J. Ferment. Technol.,1988
2. Free amino acids and peptides in musts and wines from Japanese grapes;Yokotsuka;J. Ferment. Technol.,1975
3. An improved method for fluorometric amino acid analysis including proline and hydroxyproline;Yokotsuka;J. Ferment. Technol.,1983
4. Analysis of wines produced at the Institute winery of Yamanashi University;Yokotsuka,1983