Unibank TITJUR Opinion of Mr Advocate General La Pergola delivered on 2 February 1999. # Unibank A/S v Flemming G. Christensen. # Reference for a preliminary ruling: Bundesgerichtshof - Germany. # Brussels Convention - Interpretation of Article 50 - Meaning of 'document which has been formally drawn up or registered as an authentic instrument and is enforceable in one Contracting State' - Document drawn up without any involvement of a public officer - Articles 32 and 36. # Case C-260/97.