W. D. Zhang, B. Xu, Y. X. Hong, Y. X. Yu, J. S. Ye and J. Q. Zhang, “Electrochemical Oxidation of Salicylic Acid at Well-Aligned Multiwalled Carbon Nanotube Electrode and Its Detection,” Journal of Solid State Electrochemistry, Vol. 14, 2010, pp. 1713-1718.