1. Head Deputy, Dept. of Wood and Timber Engrg., Otto Graf Inst., Univ. of Stuttgart, Pfaffenwaldring 4b, D-70569 Stuttgart, Germany.
2. Res. Engr., Dept. of Wood and Timber Engrg., Otto Graf Inst., Univ. of Stuttgart, Pfaffenwaldring 4b, D-70569 Stuttgart, Germany.