1. Bard AJ, Faulkner LR (2001) Electrochemical Methods, 2nd edn. Wiley, New York
2. Chao M, Ma X, Li X (2012) Int J Electrochem Sci 7:2201–2213
3. European Commission (2010) Commission Regulation (EU) No 37/2010 of 22 December 2009 on pharmacologically active substances and their classification regarding maximum residue limits in foodstuffs of animal origin. Off J Eur Union L15:1–72
4. Geim AK, Novoselov KS (2007) Nat Mater 6:183–191
5. Gu C, Xiang B, Xu J (2012) Spectrochim Acta Part A 97:594–599