Abeywickrama, B.A.: The vegetation of the lowlands of Ceylon in relation to soil (Trop. Soils & Veget. – Proc. Abidjan Symp. 1961, 87-92). Abraham, A., C.A. Ninan & P.M. Mathew: Studies on the cytology and phylogeny of the Pteridophytes. VII. Observations on one hundred species of South Indian ferns (J. Ind. Bot. Soc. 41, 1962, 339-421, 115 fig., 23 tables).