O. Pekkala

Cellulose crystallinity and ordering of hemicelluloses in pine and birch pulps as revealed by solid-state NMR spectroscopic methods

B. Hortling, T. Tamminen, S. Maunu, 2003 .

Some effects of extended delignification on lignin in kraft cooking

O. Pekkala, 1985 .

Black liquor pretreatment in kraft cooking

J. Engström, B. Lönnberg, O. Pekkala, 1994 .

Effects of delignification on residual lignin-carbohydrate complexes in normal pine wood and pine wood enriched in compression wood. 1. Kraft pulping

B. Hortling, T. Tamminen, O. Pekkala, 2001 .

Prolonged kraft cooking modified by anthraquinone and polysulphide

O. Pekkala, 1986 .