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1. Comparative study of temporal changes in pigments and optical properties in sepals of Helleborus odorus and H. niger from prebloom to seed production Mateja Grašič, Maja Dacar, Alenka Gaberščik, 2022, original scientific article Keywords: understorey, Helleborus niger, Helleborus odorus, spring geophyte, sepals, optical properties, photochemical efficiency |