Update README.md

README.md

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 Photoplethysmography (PPG) has emerged as a non-invasive method for monitoring cardiovascular health. This model estimates vascular age (AI-vascular age) from PPG signals, offering insights into an individual's cardiovascular health and associated risks. 
 
-The model was developed and evaluated using data from the UK Biobank (UKBB) cohort, where PPG signals were collected in a standardized format.
+The model was developed and evaluated using data from the UK Biobank (UKBB) cohort, where PPG signals were collected in a standardized format. For more details, please refer to our [research article](https://arxiv.org/abs/2502.12990).
 
 ## Use Case