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 220 OP 220 VO 48 IS 5 A1 Kawamura, K. YR 1994 UL http://journal.pda.org/content/48/5/220.abstract AB