Baumol, W. J., & Robyn, D. L. (2006). Toward an evolutionary regime for spectrum governance: Licensing or unrestricted entry? AEI-Brookings Joint Center for Regulatory Studies.

Baumol, William J., and Dorothy L. Robyn. Toward an Evolutionary Regime for Spectrum Governance: Licensing or Unrestricted Entry? Washington, D.C.: AEI-Brookings Joint Center for Regulatory Studies, 2006.

Baumol, William J., and Dorothy L. Robyn. Toward an Evolutionary Regime for Spectrum Governance: Licensing or Unrestricted Entry? AEI-Brookings Joint Center for Regulatory Studies, 2006.