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Nguyen, Khang Sinh; Averyanov, Leonid V.; Tillich, H.-J.; Pham, Van The; Maisak, Tatiana V.; Sam, Ly Ngoc (2017): Aspidistra cyathiflora var. bifolia and A-neglecta spp. nov (Convallariaceae) from northern Vietnam. In: Nordic Journal of Botany, Vol. 35, No. 4: pp. 482-487