Update README.md

mpra/README.md

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 # QuASAR-MPRA: Accurate allele-specific analysis for massively parallel  reporter assays
-We have further developed our method for allele specific analysis QuASAR (quantitative allele-specific analysis of reads) ([Harvey et al, 2015]) to analyze allele specific signals in barcoded read counts data from MPRAs. Using this approach, we can take into account the uncertainty on the original plasmid proportions, over-dispersion, and sequencing errors. Here, we demonstrate how to use QuASAR-MPRA to analyze the MPRA data by [Tewhey et al,2016].
+We have further developed our method for allele specific analysis QuASAR (quantitative allele-specific analysis of reads) ([Harvey et al, 2015]) to analyze allele specific signals in barcoded read counts data from MPRAs (preprint available in [Kalita et al,2017]). Using this approach, we can take into account the uncertainty on the original plasmid proportions, over-dispersion, and sequencing errors. Here, we demonstrate how to use QuASAR-MPRA to analyze the MPRA data by [Tewhey et al,2016].
 
 The current software is still in development and we will kindly appreciate any comments and bug reports. We assume that you already have installed the QuASAR library. 
 
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 <!-- links -->
+[Kalita et al,2017]:http://biorxiv.org/content/early/2017/02/03/105627
 [Harvey et al, 2015]:http://bioinformatics.oxfordjournals.org/content/31/8/1235
 [mpra.R]:mpra.R
 [process.R]:process.R