Artikel 18

1. Each Contracting Party undertakes to grant within its territory, to migrant workers and members of their families, equality of treatment with its own nationals, in the matter of social security, subject to conditions required by national legislation and by bilateral or multilateral agreements already concluded or to be concluded between the Contracting Parties concerned.
2. The Contracting Parties shall moreover endeavour to secure to migrant workers and members of their families the conservation of rights in course of acquisition and acquired rights, as well as provision of benefits abroad, through bilateral and multilateral agreements.