1. P. McDonald, The Biochemistry of Silage (1981), John Wiley and Sons, Ltd. (Eds.).
2. M. P. Hegarty, P. J. Peterson, Free Aminoacids, Bound Aminoacids, Amines and Ureides in: Chemistry and Biochemistry of Herbage.G. W. Butler andR. W. Bailey (Eds.), Academic Press (1973).
3. R. A. Morrisette, W. E. Link, J. Gas Chromatography3, 67 (1965).
4. L. Birkofer, M. Donike, J. Chromatogr.26, 270 (1967).
5. A. G. Giumanini, G. Chiavari, F. L. Scarponi, Analytical Chemistry48, 484 (1976).