Alexander CW Smith, Kupchik, Yonatan M, Scofield, Michael D, Gipson, Cassandra D, Wiggins, Armina , Thomas, Charles A, and Kalivas, Peter W. 2014. ?Synaptic Plasticity Mediating Cocaine Relapse Requires Matrix Metalloproteinases.?. Nat Neurosci, 17, Pp. 1655-7. doi:10.1038/nn.3846.