“Hypoglycemic effect of crude water soluble polysaccharide extracted from tubers of purple and yellow water yam (Dioscorea alata L.) on alloxan-induced hyperglycemia Wistar rats”, Progr Nutr, vol. 20, no. 1-S, pp. 59–67, Aug. 2018, doi: 10.23751/pn.v20i1-S.5322.