Update README.md

README.md

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 ## Description
 
 AstroM3Processed is a time-series astronomy dataset containing photometry, spectra, and metadata features for variable stars. 
+The dataset was constructed by cross-matching publicly available astronomical datasets, 
+primarily from the ASAS-SN (Shappee et al. 2014) variable star catalog (Jayasinghe et al. 2019) 
+and LAMOST spectroscopic survey (Cui et al. 2012), along with data from 
+WISE (Wright et al. 2010), GALEX (Morrissey et al. 2007), 2MASS (Skrutskie et al. 2006) and Gaia EDR3 (Gaia Collaboration et al. 2021).
+
 The dataset includes multiple subsets (`full`, `sub10`, `sub25`, `sub50`) and supports different random seeds (`42`, `66`, `0`, `12`, `123`). 
 Each sample consists of:
 
@@ -1132,4 +1137,11 @@ dataset = load_dataset("MeriDK/AstroM3Processed", name="sub25_123")
 }
 ```
 
-
+## References
+1. Shappee, B. J., Prieto, J. L., Grupe, D., et al. 2014, ApJ, 788, 48, doi: 10.1088/0004-637X/788/1/48
+2. Jayasinghe, T., Stanek, K. Z., Kochanek, C. S., et al. 2019, MNRAS, 486, 1907, doi: 10.1093/mnras/stz844
+3. Cui, X.-Q., Zhao, Y.-H., Chu, Y.-Q., et al. 2012, Research in Astronomy and Astrophysics, 12, 1197, doi: 10.1088/1674-4527/12/9/003
+4. Wright, E. L., Eisenhardt, P. R. M., Mainzer, A. K., et al. 2010, AJ, 140, 1868, doi: 10.1088/0004-6256/140/6/1868
+5. Morrissey, P., Conrow, T., Barlow, T. A., et al. 2007, ApJS, 173, 682, doi: 10.1086/520512
+6. Skrutskie, M. F., Cutri, R. M., Stiening, R., et al. 2006, AJ, 131, 1163, doi: 10.1086/498708
+7. Gaia Collaboration, Brown, A. G. A., et al. 2021, AAP, 649, A1, doi: 10.1051/0004-6361/202039657