Queiros, M., J. Ormonde, and I. Nogueira. “Cariological and Phytogeographic Notes on Some Pteridophyta from Portugal. I”. Acta Botanica Malacitana, vol. 13, Dec. 1988, pp. 121-40, doi:10.24310/Actabotanicaabmabm.v13i.9414.