Immobilization of enzymes on polypropylene bead surfaces by anhydrous ammonia gaseous plasma technique - Sipehia, R.; Chawla, A. S.; Daka, J.; Chang, T. M. S. (Wiley-Blackwell, 1988)
http://dx.doi.org/10.1002/jbm.820220505
Keywords: WW-YZ; ZG