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France CP, Gerak LR, Rowlett JK, Woolverton WL, Winger G, Woods JH.France CP, et al. Among authors: woolverton wl.NIDA Res Monogr. 1998 Mar;178:429-39.NIDA Res Monogr. 1998.PMID: 9686406No abstract available.
Nader MA, Woolverton WL.Nader MA, et al. Among authors: woolverton wl.NIDA Res Monogr. 1990;105:621.NIDA Res Monogr. 1990.PMID: 1876148No abstract available.