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Williams, C.N. (1971) Growth and productivity of tapioca (manihot utilissima) ii. stomatal functioning and yield. Experimental Agriculture, 7 (1). pp. 49-62. ISSN 0014-4797, DOI https://doi.org/10.1017/S0014479700004786.
Williams, C.N. and Thomas, Roger L. (1970) Observations on sex differentiation in the oil palm, Elaeis guineensis L. Annals of Botany, 34 (4). pp. 937-963. ISSN 0305-7364, DOI https://doi.org/10.1093/oxfordjournals.aob.a084425.