Nikoshkov, A., Drakenberg, K., Wang, X., Horvath, M. C., Keller, E., & Hurd, Y. L. (2008). Opioid neuropeptide genotypes in relation to heroin abuse: Dopamine tone contributes to reversed mesolimbic proenkephalin expression. National Academy of Sciences.

Nikoshkov, Andrej, Katarina Drakenberg, Xinyu Wang, Monika Cs Horvath, Eva Keller, e Yasmin L. Hurd. Opioid Neuropeptide Genotypes in Relation to Heroin Abuse: Dopamine Tone Contributes to Reversed Mesolimbic Proenkephalin Expression. National Academy of Sciences, 2008.

Nikoshkov, Andrej, et al. Opioid Neuropeptide Genotypes in Relation to Heroin Abuse: Dopamine Tone Contributes to Reversed Mesolimbic Proenkephalin Expression. National Academy of Sciences, 2008.