Bellah O Pule, et al. “Electrospun Fibre Colorimetric Probe Based on Gold Nanoparticles for on-Site Detection of 17β-Estradiol Associated With Dairy Farming Effluents”. Water SA, vol. 41, no. 1 January, Dec. 2014, https://doi.org/10.4314/wsa.v41i1.5.