RT Journal Article SR Electronic T1 LETTER TO THE EDITOR JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 64 OP 64 VO 46 IS 3 A1 J. Sharp YR 1992 UL http://journal.pda.org/content/46/3/64.abstract AB