FOOD-DEPRIVATION LEVEL ALTERS THE EFFECTS OF MORPHINE ON PIGEONS' KEY PECKING
1998 ◽
Vol 69
(3)
◽
pp. 295-310
◽
1972 ◽
Vol 9
(5)
◽
pp. 795-800
◽
Keyword(s):
1995 ◽
Vol 64
(1)
◽
pp. 61-73
◽
1969 ◽
Vol 115
(2)
◽
pp. 237-246
◽
Keyword(s):