Jason Ord, Timothy Strecker, "Developing a Tool for Routine Carbon Footprint Assessment of Printing Systems" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP26), 2010, pp 102 - 103, https://doi.org/10.2352/ISSN.2169-4451.2010.26.1.art00027_1