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Patent N 0345715 A1 (EP). C12S3/08, C12P19/04, D21C9/16, C12P19/14, D21C5/00, D21C9/10. Enzymatic delignification of lignocellulosic material // Olsen W.L., Slocomb J.P., Gallagher H.P., Burris A.K.; Proprietor(s): -International Paper Company; - Application N 19890110176, 06.06.1989.; - Date publication 13.12.1989.