1. Adler, L.S., 2001. The ecological significance of toxic nectar. Oikos 91: 409-420. https://doi.org/10.1034/j.1600-0706.2000.910301.x.
2. Arnold, S.E.J., Dudenhöffer, J., Fountain, M.T., James, K.L., Hall, D.R., Farman, D.I., Wäckers, F.L. and Stevenson, P.C., 2021. Bumble bees show an induced preference for flowers when primed with caffeinated nectar and a target floral odor. Current Biology 31: P4127-4131. https://doi.org/10.1016/jxub.2021.06.068
3. Baker, H.G. and Baker, I., 1973. Amino-acids in nectar and their evolutionary significance. Nature 241: 543-545. Baker, H.G. and Baker, I., 1979. Sugar ratios in nectars. Phytochemical Bulletin 12: 43-45.
4. Baker, H.G. and Baker, I., 1983. Floral nectar-sugar constituents in relation to pollinator type. In: Jones, C.E. and Little, R.J. (eds.) Handbook of experimental pollination biology. Van Nostrand Reinhold, New York, NY, USA, pp. 117-141.
5. Barlow, S.E., Wright, G.A., Ma, C., Barberis, M., Farrell, I.W., Marr, E.C., Brankin, A., Pavlik, B.M. and Stevenson, P.C., 2017. Distasteful nectar deters floral robbery. Current Biology 27: 2552-2558. https://doi.org/10.1016/j.cub.2017.07.012.