1. Eggeling L, Sahm H, de Graaf AA (1996) Quantifying and directing metabolite flux: application to amino acid overproduction. In: Scheper T (ed) Advances in biochemical engineering/biotechnology, vol 54: Metabolic engineering. Springer, Berlin Heidelberg New York, p 2
2. Katsumata R, Ikeda M (1997) Process for producing 1-tryptophan, 1-tyrosine or 1-phe-nylalanine. US Pat 5, 605, 818
3. Katsumata R, Hashimoto S (1996) Process for producing 1-valine. US Pat 5, 521, 074
4. Mizukami T, Katsumata R, Oka T (1990) Process for producing histidine. US Pat 4, 927, 758
5. Malumbres M, Martin JF (1996) FEMS Microbiol Lett 143: 103