add citations

README.md

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 # ViralWasm
-A client-side WebAssembly tool suite for viral molecular epidemiology
+A client-side user-friendly web application suite for viral genomics.
+
+## Citing ViralWasm
+
+If you use ViralWasm in your work, please cite:
+
+> Ji D, Aboukhalil R, Moshiri N (2023). "ViralWasm: a client-side user-friendly web application suite for viral genomics." *Bioinformatics*. btae018. [doi:10.1093/bioinformatics/btae018](https://doi.org/10.1093/bioinformatics/btae018)
+
+Please also cite the corresponding tools used in each pipeline:
+
+For ViralWasm-Epi, see the [ViralWasm-Epi README](https://github.com/Niema-Lab/ViralWasm-Epi/blob/master/README.md#citing-viralwasm-epi).
+
+For ViralWasm-Consensus, see the [ViralWasm-Consensus README](https://github.com/Niema-Lab/ViralWasm-Consensus/blob/master/README.md#citing-viralwasm-consensus).