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 164 OP 164 VO 38 IS 4 A1 Schroeder, Hans G. YR 1984 UL http://journal.pda.org/content/38/4/164.abstract AB