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 2 OP 3 VO 47 IS 1 A1 Sharp, J. YR 1993 UL http://journal.pda.org/content/47/1/2.abstract AB