Minimal Lossless Decompositions and Some Normal Forms Between 4NF and PJ/NF. - Ragnar Normann (Inf. Syst., 1998)

Technical note: Replication graphs revisited. - Jon Grov; Ragnar Normann (J. Comput. Syst. Sci., 2006)

A Closer Look at the Join-Equality Constraint. - Gerhard Skagestein; Ragnar Normann (OTM Workshops, 2008)

A theoretical study of 'Snapshot Isolation'. - Ragnar Normann; Lene T. Østby (ICDT, 2010)