1. ASTM Standard E679-04 (2011). Standard Practice for Determination of Odor and Taste Thresholds By a Forced-Choice Ascending Concentration Series Method of Limits. ASTM [online] Available through: http://www.astm.org.
2. Fatigue in older adults: An early indicator of the aging process?;Avlund;Aging Clinical and Experimental Research,2010
3. Effect of age, sex and illness on salt taste detection thresholds;Baker;Age and Ageing,1983
4. The effect of age on plasma zinc uptake and taste acuity;Bales;The American Journal of Clinical Nutrition,1986
5. Very rapid, precise assessment of effects of constituent variation on product acceptability: Consumer sweetness preferences in a lime drink;Conner;Lebensmittel-Wissenschaft & Technologie Food Science & Technology,1986