@conference{paul1993preliminary, title = {Preliminary Results of a 20-Bit Digital-to-Analog Converter Using Pulse-Width Modulation}, author = {Paul, Allan and Sandler, Mark}, booktitle = {Audio Engineering Society Convention 95}, month = {Oct}, year = {1993}, url = {https://www.aes.org/e-lib/browse.cfm?elib=6467} }