Update README.md

Author: trangle1302

README.md

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 # HPA_SingleCellClassification_Analysis
 Analysis for Kaggle Human Protein Atlas Single Cell Classification challenge
 
-This repo is for analysis of the [HPA Single Cell Classification](https://www.kaggle.com/c/hpa-single-cell-image-classification) results. 
+This repo is for analysis of the [HPA Single Cell Classification](https://www.kaggle.com/c/hpa-single-cell-image-classification) results.
+
+The [paper](https://www.nature.com/articles/s41592-022-01606-z) was published in Nature Methods volume 19, pages1221–1229 (2022).
 
 ## Content
 This includes 
@@ -12,4 +14,4 @@ This includes
 
 ## License
 [MIT License](https://opensource.org/licenses/MIT)
-[Apache License 2.0](models/LICENSE)
+[Apache License 2.0](models/LICENSE)