6Laivins, G. V, Seallan, A. M.. The mechanism of hornifieation of wood pulps[ C]. In proceedings of the 10th Fundamental Research Symposium. Oxford, UK, 1993:1235 - 1260
7Howard, R. C. , Bichard, W.. The basic effects of recycling on pulp properties[ J]. Pulp Paper Sci. 1992,18(4) ,J151 - J159.
8Gurnagul N, Sodium hydroxide addition during recycling: effects on fiber swelling and sheet strength [ J ]. Tappi. 1995.78 (12) :119 - 124
9L. Scott Jackson, John A. Heitmann, and Thomas W. Joyce. Enzymatic modifications of secondary fiber[ J]. Tappi. 1993,76 (3) :147 - 154
10Ganapati R. Bhat, John A. Heitmann, and Thomas W. Joyce, Novel techniques for enhancing the strength of secondary fiber [ J].Tappi 1991, 74(9) :151 - 157