Rajagopal, G2009-05-282009-05-281984-07-01Rajagopal G. A simple colorimetric procedure for estimation of citric acid in urine. Indian Journal of Experimental Biology. 1984 Jul; 22(7): 391-2http://imsear.searo.who.int/handle/123456789/56520engCitrates --urineCitric AcidColorimetry --methodsHumansJournal Article