1. Piironen, Vieno; Toivo, Jari; Puupponen-Pimi, Riitta; Lampi, Anna-Maija: Plant sterols in vegetables, fruits and berries J Sci Food Agric. 2003;83:330.
  2. Biehler, E.; Alkerwi, A.; Hoffmann, L.; Krause, E.; Guillaume, M.; Lair, M. L.; Bohn, T.: Contribution of violaxanthin, neoxanthin, phytoene and phytofluene to total carotenoid intake: Assessment in Luxembourg Journal of Food Composition and Analysis. 2012;25:56.