Helsinki 1975 21 the help, in appropriate cases, of international organizations of a governmental or nongovernmental character as well as of private institutions — competent and active in these fields — envisaging for this purpose: ◆◆ periodic meetings of experts of the interested parties to elaborate the necessary proposals, while bearing in mind the need to consider these questions in a wider social and economic context; ◆◆ the publication in appropriate periodicals of articles designed to make known and to compare, among the participating States, the most significant achievements and innovations; ◆◆ a joint study with a view to the improvement and possible harmonization of the different systems used to inventory and catalogue the historical monuments and places of cultural interest in their countries; ◆◆ the study of the possibilities for organizing international courses for the training of specialists in different disciplines relating to restoration. *** National minorities or regional cultures. The participating States, recognizing the contribution that national minorities or regional cultures can make to co-operation among them in various fields of culture, intend, when such minorities or cultures exist within their territory, to facilitate this contribution, taking into account the legitimate interests of their members. 4. Co-operation and Exchanges in the Field of Education The participating States, Conscious that the development of relations of an international character in the fields of education and science contributes to a better mutual understanding and is to the advantage of all peoples as well as to the benefit of future generations, Prepared to facilitate, between organizations, institutions and persons engaged in education and science, the further development of exchanges of knowledge and experience as well as of contacts, on the basis of special arrangements where these are necessary, Desiring to strengthen the links among educational and scientific establishments and also to encourage their co-operation in sectors of common interest, particularly where the levels of knowledge and resources require efforts to be concerted internationally, and Convinced that progress in these fields should be accompanied and supported by a wider knowledge of foreign languages, Express to these ends their intention in particular: (a) Extension of Relations To expand and improve at the various levels co-operation and links in the fields of education and science, in particular by: • concluding, where appropriate, bilateral or multilateral agreements providing for cooperation and exchanges among State institutions, non-governmental bodies and persons