1. Long, Y.Q., Pulping and Papermaking Principles and Engineering, China Light Industry Press, Beijing, 1980.
2. Wu, F.Q., North Paper Making 18(4): 21(1997).
3. Gupta, H.K., Shivhare, P., Roy, T.K., et al., IPPTA 9(2): 29(1997).
4. Myreen, B., Int. Chem. Recovery Conf., TAPPI PRESS, Atlanta, GA, USA, 1998, p. 823.
5. Myreen, B., U.S. pat. 6,183,598 (Feb. 6, 2001).