QGRS Mapper: a web-based server for predicting G-quadruplexes in nucleotide sequences. - Oleg Kikin; Lawrence D'Antonio; Paramjeet Singh Bagga (Nucleic Acids Res., 2006)

GRSDB2 and GRS_UTRdb: databases of quadruplex forming G-rich sequences in pre-mRNAs and mRNAs. - Oleg Kikin; Zachary Zappala; Lawrence D'Antonio; Paramjeet Singh Bagga (Nucleic Acids Res., 2008)