PT - JOURNAL ARTICLE AU - Horton, Linda R. TI - Regulations, Proposals, Guidelines, Advisory Opinions, and Letters of Advice: What Legal Significance? DP - 1991 May 01 TA - PDA Journal of Pharmaceutical Science and Technology PG - 138--141 VI - 45 IP - 3 4099 - http://journal.pda.org/content/45/3/138.short 4100 - http://journal.pda.org/content/45/3/138.full SO - PDA J Pharm Sci Technol1991 May 01; 45