RT Journal Article SR Electronic T1 Experimental Determination of the Pore Size of Filters JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 331 OP 332 VO 57 IS 5 A1 Albert Einstein A1 Hans Müshham YR 2003 UL http://journal.pda.org/content/57/5/331.abstract AB