1. A strategy for operational implementation of 4D-Var, using an incremental approach
2. 2003 ‘Background error covariance modelling’. Pp. 45–64 of Proceedings of Seminar on recent developments in data assimilation for atmosphere and ocean, ECMWF, Reading, UK
3. Unified Notation for Data Assimilation : Operational, Sequential and Variational (gtSpecial IssueltData Assimilation in Meteology and Oceanography: Theory and Practice)
4. 1970 Stochastic processes and filtering theory. Academic Press
5. , and 2004 ‘OSEs of all main data types in the ECMWF operation system’. Pp. 63–94 in Proceedings of third WMO Workshop on the impact of various observing systems on NWP. Alpbach, Austria, 9–12 March 2004. TD No. 1228, WMO, Geneva, Switzerland