Briggs, C. A., Anderson, D. J., Brioni, J. D., Buccafusco, J. J., Buckley, M. J., Campbell, J. E., et al. (1969). Functional characterization of the novel neuronal nicotinic acetylcholine receptor ligand GTS-21 in vitro and in vivo. Pharmacology, Biochemistry, And Behavior, 57(1-2), 231-41. https://doi.org/10.1016/s0091-3057(96)00354-1 (Original work published 1969)