Carmona, M., E. Congregado, A. A. Golpe, and J. Iglesias. “Self-Employment and Business Cycles: Searching for Asymmetries in a Panel of 23 OECD Countries”. Journal of Business Economics and Management, Vol. 17, no. 6, Dec. 2016, pp. 1155-71, doi:10.3846/16111699.2014.994027.