Augereau, Angelique, Shane Greenstein, and Marc Rysman. "Coordination versus Differentiation in a Standards War: 56K Modems." RAND Journal of Economics 37, no. 4 (Winter 2006): 889–909.

However, that hasn't stopped a Japanese company from rolling out a brand-new 56K modem for anyone still relying on ancient copper phone lines to surf the web. Planex Communications' new PL-US56K2 ...