Heroin self-administration in rats under a progressive ratio schedule of reinforcement

1993 ◽  
Vol 111 (2) ◽  
pp. 215-218 ◽  
Author(s):  
D. C. S. Roberts ◽  
S. A. L. Bennett
1999 ◽  
Vol 147 (2) ◽  
pp. 135-142 ◽  
Author(s):  
E. C. Donny ◽  
A. R. Caggiula ◽  
M. M. Mielke ◽  
S. Booth ◽  
M. A. Gharib ◽  
...  

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