Le Langage de Requête Temporel FTL. - Laurent Herr (BDA, 1995)

Temporal Connectives versus Explicit Timestamps in Temporal Query Languages - Serge Abiteboul; Laurent Herr; Jan Van den Bussche (Temporal Databases, 1995)

Temporal Versus First-Order Logic to Query Temporal Databases. - Serge Abiteboul; Laurent Herr; Jan Van den Bussche (PODS, 1996)

Temporal Connectives Versus Explicit Timestamps to Query Temporal Databases. - Serge Abiteboul; Laurent Herr; Jan Van den Bussche (J. Comput. Syst. Sci., 1999)