Couto, J. P. A., M. T. B. Tiago, J. C. Vieira, and F. J. F. Silva. “The Propensity And Intensity Of Export Activities Of Companies Operating In Europe”. Journal of Applied Business Research (JABR), vol. 24, no. 4, Oct. 2008, doi:10.19030/jabr.v24i4.1332.