P. SUSHAMA and M. ALAUDEEN, “Synthetic, Spectral and Antibacterial Studies of Co(III) and Mn(III) Metal Chelates of 2,5-Dihydroxy undecyl 1,4-Benzoquinone and its Azo Derivatives ”, ajc, vol. 15, no. 1, pp. 366–372, Mar. 2010.