Vermaat, J.G.Bentley, C.F.2007-11-132007-11-131955Vermaat, J. G., & Bentley, C. F. (1955). The age and channeling of Ceylon laterite. Soil Science, 79(4), 239-248.http://hdl.handle.net/10625/19450Study of the age and occurrence of laterite soil in Sri Lanka, and its channeling by earthworms - includes bibliography.enSOILSSRI LANKAJournal Article (peer-reviewed)