[49: "Study on Cross-Border Cooperation: Capitalising on existing initiatives for cooperation in cross-border regions", Gesundheit Österreich Forschungs und Planungs GmbH, SOGETI, Maastricht University, 2017][50: See the General Secretariat of the Benelux Union studies, e.g. "Barriers and Opportunities in the Benelux", February 2018.]
"Study on Cross-Border Cooperation: Capitalising on existing initiatives for cooperation in cross-border regions", Gesundheit Österreich Forschungs und Planungs GmbH, SOGETI, l-Università ta' Maastricht, 2017][50: