L.E. Dodd, M.C. Rosamond, A.J. Gallant and D. Wood, “Development of Phase Shift Lithography for the Production of Metal-Oxide-Metal Diodes” IET Micro and Nano Letters, vol. 9, no. 7, pp. 437-440, July 2014, DOI: 10.1049/mnl.2014.0102.