Zeilhofer, H. U., Swandulla, D., Geisslinger, G., & Brune, K. (1992). Differential effects of ketamine enantiomers on NMDA receptor currents in cultured neurons. European Journal of Pharmacology, 213(1), 155-158. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6T1J-47BXCSJ-2HG-1&_cdi=4892&_user=38661&_pii=0014299992902483&_origin=search&_coverDate=03%2F17%2F1992&_sk=997869998&view=c&wchp=dGLbVlz-zSkWb&md5=d7699d93c254c6b0a5a5598de035d9ea&ie=/sdarticle.pdf.