PT - JOURNAL ARTICLE AU - Julius Z. Knapp TI - Particle Counting Errors DP - 1989 Mar 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 59--59 VI - 43 IP - 2 4099 - http://journal.pda.org/content/43/2/59.short 4100 - http://journal.pda.org/content/43/2/59.full SO - PDA J Pharm Sci Technol1989 Mar 01; 43