Third Meeting of the Mediterranean Network of Law Enforcement Officials relating to MARPOL within the framework of the Barcelona Convention (MENELAS), Valletta, Malta, 15-16 October 2019: Study based on a literature review on existing best practices in the Mediterranean as well as other European regional seas for the application of charges at reasonable costs and of the No-Special-Fee system for the use of port reception facilities (REMPEC/WG.46/INF.4)