Update README.md

README.md

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 ### Projects using keras-retinanet
+* [Improving RetinaNet for CT Lesion Detection with Dense Masks from Weak RECIST Labels](https://arxiv.org/abs/1906.02283). Research project for detecting lesions in CT using keras-retinanet.
 * [NudeNet](https://github.com/bedapudi6788/NudeNet). Project that focuses on detecting and censoring of nudity.
 * [Individual tree-crown detection in RGB imagery using self-supervised deep learning neural networks](https://www.biorxiv.org/content/10.1101/532952v1). Research project focused on improving the performance of remotely sensed tree surveys.
 * [ESRI Object Detection Challenge 2019](https://github.com/kunwar31/ESRI_Object_Detection). Winning implementation of the ESRI Object Detection Challenge 2019.