Intravenous self-administration of methamphetamine-heroin (speedball) combinations under a progressive-ratio schedule of reinforcement in rats

Neuroreport ◽  
2000 ◽  
Vol 11 (12) ◽  
pp. 2621-2623 ◽  
Author(s):  
Robert Ranaldi ◽  
Roy A. Wise
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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