RT Journal Article SR Electronic T1 Validation of Tangential Flow Filtration (TFF) Systems JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 218 OP 223 VO 45 IS 5 A1 Michaels, Stephen L. YR 1991 UL http://journal.pda.org/content/45/5/218.abstract AB