1Espy, H. Wet Strength Resins. Stock Preparation. Pulp And Paper Manufacture, Edited By R.W. Hagemeyer, Joint Textbook. Committee of The Paper Industry, 1992,6:(4)65 - 85.
2Britt, K.W. Some observations on wet - paper. Paper Ind. Paper World, 1994, 26 ( 1 ) : 37 - 41, 46.
3Dunlop-Jones, N. Wet Strength Chemistry. Paper Chemistry. Edited By J. C. Robers. Chapman And Hall, New York,1991, (6) :76 - 96.
4Espy, H. H. TappiJ, 1987,70(7):129 -133.
5Wasser, R. B. Pulp and Paper Chemistry and Chemical Technology. J. P. Casey, New York, 1980,3.