GDoM: a Multilevel Document Manager. - Christel Calas (ESORICS, 1992)

UNIX Services for Multilevel Storage and Communications Over a Secure LAN. - Bruno d'Ausbourg; Christel Calas (USENIX Winter, 1993)

Distributed File System over a Multilevel Secure Architecture - Problems and Solutions. - Christel Calas (ESORICS, 1994)

Implementing Secure Dependencies over a Network by Designing a Distributed Security SubSystem. - Bruno d'Ausbourg; Christel Calas (J. Comput. Secur., 1996)