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 101 OP 101 VO 39 IS 2 A1 Hans G. Schroeder YR 1985 UL http://journal.pda.org/content/39/2/101.abstract AB