YUAN, Z. - NI, Y. - HEININGEN, A.R.P. Peracetic acid and hydrogen peroxide brightening of a softwood kraft pulp delignified by methanol - assisted ozonation. In Paperi ja Puu. - Helsinki : Suomen Paperi- ja Puutavaralehti Oy, 1998. ISSN 0031-1243, 1998, vol. 80, no. 4, s. 310-314.