Journal Article
                        
                        Halperin, Daniel, Owen  Mugurungi, Timothy  Hallett, Backson  Muchini, Bruce  Campbell, Tapuwa  Magure, Clemens  Benedikt, and Simon  Gregson.  
"A surprising prevention success: Why did the HIV epidemic decline in Zimbabwe?." PLoS Medicine 8, no. 2 (2011).