1. Baker HG, Baker I (1975) Studies of nectar-constituents and pollinator-plant coevolution. In: Gilbert LE, Raven PH (eds) Coevolution of plants and animals. University Press of Texas, Austin
2. Baker HG, Baker I (1982) Chemical constituents of nectar in relation to pollination mechanism and phylogeny. In: Nitecki MH (ed) Biochemical aspects of evolutionary biology. University of Chicago Press, Chicago, pp 131–171
3. Barrera E, Nobel PS (2004) Nectar: properties, floral aspects, and speculations on origin. Trends Plant Sci 9:65–69
4. Bronner R (1975) Simultaneous demonstration of lipids and starch in plant tissues. Stain Technol 81:129–137
5. Canto A, Herrera CM, García IM, Pérez R, Vaz M (2011) Intraplant variation in nectar traits in Helleborus foetidus (Ranunculaceae) as related to floral phase, environmental conditions and pollinator exposure. Flora 206:668–675.
https://doi.org/10.1016/j.flora.2011.02.003