Composition Optimization of the Nutrient Medium by Plakett-Berman Design for Increasing the Enzyme Activity of Cellulolytic Complex of Fennellia sp. 2806 - S. O. Syrchin; A. K. Pavlychenko; O. S. Kharkevych; L. T. Nakonechna; O. M. Yurieva; I. M. Kurchenko (Microbiological Journal, 2017)