Opinion of Mr Advocate General Lenz delivered on 12 December 1989. # Rosaria Vella and others v Alliance nationale des mutualités chrétiennes. # Reference for a preliminary ruling: Cour du travail de Mons - Belgium. # Social security for migrant workers - Period of incapacity in respect of which an allowance was received treated as a period of insurance. # Case C-324/88.

Opinion of the Advocate-General

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Mr Advocate General Lenz delivered his Opinion on 12 December 1989 . (*) He concluded by proposing that the Court should reply as follows to the question submitted to it for a preliminary ruling by the cour du travail, Mons :

"It follows from Article 1(r ) of Regulation No 3 and Article 1(r ) of Regulation ( EEC ) No 1408/71 that the periods which may be treated as periods of insurance are determined solely by reference to domestic legislation ."

(*) Original language : German .