J. D. Ranjit, R. Suwanketnikom, S. Chinawong, S. Suprakarn, I. Sooksathan, and S. Juntakool, “Weed Seed Bank Response to Soil Depth, Tillage and Weed Management in the Mid Hill Ecology”, Agr. Nat. Resour., vol. 41, no. 1, pp. 17–33, Mar. 2007.