Regional Workshop on Cooperation Arrangements in the Field of Preparedness and Response to Oil and Hazardous and Noxious Substances (HNS) Spills (MEDEXPOL 2016): Guidelines concerning the exchange of liaison officers between the contracting parties in case of response operations involving several states”, adopted by the he Ninth Ordinary Meeting of the Contracting Parties to the Barcelona Convention, Barcelona, 5 - 8 June 1995 (UNEP(OCA)/MED IG.5/16, Annex XII, Appendix IV)