6 have entered their territory pursuant to programmes of labour recruitment or under immigration schemes. Article 18. - Self-employment The Contracting States shall accord to a refugee lawfully in their territory treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances, as regards the right to engage on his own account in agriculture, industry, handicrafts and commerce and to establish commercial and industrial companies. Article 19. - Liberal professions 1. Each Contracting State shall accord to refugees lawfully staying in their territory who hold diplomas recognized by the competent authorities of that State, and who are desirous of practising a liberal profession, treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances. 2. The Contracting States shall use their best endeavours consistently with their laws and constitutions to secure the settlement of such refugees in the territories, other than the metropolitan territory, for whose international relations they are responsible. Chapter IV WELFARE Article 20. - Rationing Where a rationing system exists, which applies to the population at large and regulates the general distribution of products in short supply, refugees shall be accorded the same treatment as nationals. Article 21. - Housing As regards housing, the Contracting States, in so far as the matter is regulated by laws or regulations or is subject to the control of public authorities, shall accord to refugees lawfully staying in their territory treatment as favourable as possible and, in any event, not less favourable than that accorded to aliens generally in the same circumstances. Article 22. - Public education 1. The Contracting States shall accord to refugees the same treatment as is accorded to nationals with respect to elementary education. 2. The Contracting States shall accord to refugees treatment as favourable as possible, and, in any event, not less favourable than that accorded to aliens generally in the same circumstances, with respect to education other than elementary education and, in particular, as regards access to studies, the recognition of foreign school certificates, diplomas and degrees, the remission of fees and charges and the award of scholarships. Article 23. - Public relief The Contracting States shall accord to refugees lawfully staying in their territory the same treatment with respect to public relief and assistance as is accorded to their nationals. Article 24. - Labour legislation and social security 1. The Contracting States shall accord to refugees lawfully staying in their territory the same treatment as is accorded to nationals in respect of the following matters;