Author Affiliations +
Oleg I. Polubojarinov,* Anatoly N. Chubinsky,* Owe Martinsson**
*Professor Oleg I. Polubojarinov, Professor Anatoly N. Chubinsky, St. Petersburg Forest Technical, Academy, St. Petersburg, Russia
**Associate Professor Owe Martinsson, Swedish University of Agricultural, Sciences, SE-901 83 Umea, Sweden