1. Multinational Drug Companies: Issues in Drug Discovery and Development;Spilker,1989
2. Innovation in the Pharmaceutical Industry;Schwartzman,1976
3. Columbia Healthcare to acquire HCA, combining 2 biggest U.S. hospital firms;Tomsho,41993
4. Users’ perceptions of mail-service pharmacy;Birtcher,1992
5. Mail order and community pharmacy prices are similar, study finds;Martin,1990