RT Journal Article SR Electronic T1 LETTERS TO THE EDITOR JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 50 OP 51 VO 47 IS 2 A1 Letters, YR 1993 UL http://journal.pda.org/content/47/2/50.abstract AB