Robert H. Detig, "Electrostatic Printing of Nano Particles for Photo-Voltaic Applications" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP25), 2009, pp 777 - 779, https://doi.org/10.2352/ISSN.2169-4451.2009.25.1.art00100_2