Please cite when you use RPISeq or RPIntDB:

Usha K. Muppirala, Vasant G. Honavar, Drena Dobbs. Predicting RNA-protein Interactions using Only Sequence Information. BMC Bioinformatics 2011, 12:489

Muppirala UK, Lewis BA, Dobbs D (2013) Computational tools for investigating RNA-protein interaction partners. J comput Sci Syst Biol 6:182-187