HARPER, Geoffrey; ROGERS, Elizabeth. Flowering curves and the summer-gap mystery. Sibbaldia: the International Journal of Botanic Garden Horticulture, [S. l.], n. 9, p. 121–142, 2011. DOI: 10.24823/Sibbaldia.2011.126. Disponível em: https://journals.rbge.org.uk/rbgesib/article/view/126. Acesso em: 13 may. 2025.