Cotârleț, M.; Bahrim, G.-E. Application of Plackett-Burman Experimental Design to Optimize the Cold-Active Alpha Amylase Biosynthesis by Psychrotrophic Streptomyces 4 Alga. The Annals of the University Dunarea de Jos of Galati. Fascicle VI - Food Technology 2012, 36, 9-19.