Update data/README.md

data/README.md

@@ -10,4 +10,26 @@ Each data entry in the ReTiNA-1 dataset is comprised of 8 columns. Examples and
 | 3 | column | ('RP', 2.1, 50, 1.7) | ```tuple``` | Details on the LC-MS column used, with the 1st element representing the column type - HILIC ('HI') vs. reverse phase ('RP'). The 2nd and 3rd elements represent the internal column diameter and column length, in mm. The third element represents the stationary phase particle width, in µm. |
 | 4 | flow_rate | 0.25 | ```float``` | The solvent front flow rate, measured in mL/min. |
 | 5 | temp | 40.0 | ```float``` | The column temperature, measured in degrees Celsius. |
-| 6 | source | massbank | ```str``` | The source the data was extract from. |
+| 6 | source | massbank | ```str``` | The source the data was extract from. |
+
+## 📋 Data Sources
+
+[DynaStl](https://doi.org/10.3390/metabo9050085): A Dynamic Retention Time Database for Steroidomics
+
+- 188 compound-environment combinations
+- 188 unique compounds
+- 1 unique LC-MS setup environment
+
+```
+@article{nguyen2019retention,
+  title={Recent Advances and Tools for Retention Time Prediction in Liquid Chromatography–Mass Spectrometry},
+  author={Nguyen, Duy Hoa and Nguyen, Chi-Hoon and Mamitsuka, Hiroshi},
+  journal={Metabolites},
+  volume={9},
+  number={5},
+  pages={85},
+  year={2019},
+  publisher={MDPI},
+  doi={10.3390/metabo9050085}
+}
+```