Anastasakos, A., A. M. Goulielmos, and A. Gatzoli. “The Effect of Maritime Security Regime (ISPS Code) on World Supply of Seafarers”. SPOUDAI Journal of Economics and Business, vol. 64, no. 1, May 2014, pp. 63-77, https://spoudai.org/index.php/journal/article/view/210.