New drug development during and after a period of regulatory change: Clinical research activity of major united states pharmacxeutical firms, 1958 to 1979
1983 ◽
Vol 33
(6)
◽
pp. 691-700
◽
1996 ◽
Vol 30
(3)
◽
pp. 745-751
◽
1988 ◽
Vol 43
(3)
◽
pp. 290-301
◽
1994 ◽
Vol 55
(6)
◽
pp. 609-622
◽
1991 ◽
Vol 50
(5/1)
◽
pp. 471-486
◽
2001 ◽
Vol 69
(5)
◽
pp. 286-296
◽
1994 ◽
Vol 19
(2)
◽
pp. 228-235
◽