Comparison of classical and ultrasound-assisted isolation procedures of cellulose from kenaf (Hibiscus cannabinus L.) and eucalyptus (Eucalyptus rodustrus Sm.) - Pappas, C.; Tarantilis, P.A.; Daliani, I.; Mavromoustakos, T.; Polissiou, M. (Ultrasonics Sonochemistry, 2002)