New Dimension in Relational Database Preservation: rising the abstraction level. - Ricardo André Pereira Freitas; José Carlos Ramalho (iPRES, 2011)

Significant Properties in the Preservation of Relational Databases. - Ricardo André Pereira Freitas (Bull. IEEE Tech. Comm. Digit. Libr., 2011)

Relational databases digital preservation - Ricardo André Pereira Freitas (2013)