ADDA: a domain database with global coverage of the protein universe. - Andreas Heger; Christopher Andrew Wilton; Ashwin Sivakumar; Liisa Holm (Nucleic Acids Res., 2005)

The global trace graph, a novel paradigm for searching protein sequence databases. - Andreas Heger; Swapan Mallick; Christopher Andrew Wilton; Liisa Holm (Bioinform., 2007)