Update README.md

README.md

@@ -288,7 +288,14 @@ The data includes 36 columns. A `split` column assigns rows into `train`, `val`,
 * `meta_reference`: Reference or source citation for the molecule.
 * `split`: Predefined data split (`train`, `val`, `test`).
 
-## Data Sources and Tools Used
+## Data Generation
+
+For a detailed description of the data generation details for an earlier version of this dataset, please consult the following technical report:
+
+_Bell, Aaron C., Timothy D. Gebhard, Jian Gong, Jaden J. A. Hastings, Atılım Güneş Baydin, G. Matthew Fricke, Michael Phillips, Kimberley Warren-Rhodes, Nathalie A. Cabrol, Massimo Mascaro, and Scott Sanford. 2022. Signatures of Life: Learning Features of Prebiotic and Biotic Molecules. NASA Frontier Development Lab Technical Memorandum._
+https://oxai4science.github.io/assets/pdf/bell-2022-molecules.pdf
+
+### Sources and Tools Used
 
 * ChEMBL: [https://www.ebi.ac.uk/chembl/](https://www.ebi.ac.uk/chembl/)
 * RDKit: [https://www.rdkit.org/](https://www.rdkit.org/)