1. Althen, J., Ten-Kate, J., Stafford, A., & Thresher, K. (2017). Mail as a branding tool: Recent research and the path forward. Presented at the 25th Conference on Postal and Delivery Economics. Barcelona.
2. Borjas, G. J. (1980). The relationship between wages and weekly hours of work: The role of division bias. The Journal of Human Resources, 15(3), 409–423.
3. Bzhilyanskaya, L. Y., Cigno, M., & Pearsall, E. S. (2015). A branching AIDS model for estimating U.S. Postal Price elasticities. In M. A. Crew & T. J. Brennan (Eds.), Postal and delivery innovation in the digital economy (pp. 91–113). Cham: Springer.
4. Davidson, R., & MacKinnon, J. (2004). Econometric theory and methods. Oxford: Oxford University Press.
5. Fève, F., Magnac, T., Soteri, S., & Veruete-McKay, L. (2018). Price elasticities and factors driving international contract export mail sent from the UK to Western European Countries. In P. L. Parcu, T. Brennan, & V. Glass (Eds.), (pp. 299–310). Berlin: Springer.