Update README.md

README.md

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 2017-2019 Sky Images and Photovoltaic Power Generation Dataset for Short-term Solar Forecasting (Stanford Benchmark).
 
 
-Nie, Y., Li, X., Scott, A., Sun, Y., Venugopal, V., and Brandt, A. (2022). 2017-2019 Sky Images and Photovoltaic Power Generation Dataset for Short-term Solar Forecasting (Stanford Benchmark). Stanford Digital Repository. https://purl.stanford.edu/dj417rh1007
+Nie Y, Li X, Scott A, Sun Y, Venugopal V, Brandt A. SKIPP’D: A SKy Images and Photovoltaic Power Generation Dataset for short-term solar forecasting. Solar Energy. 2023 May 1;255:171-9.
+
+@article{nie2023skipp,
+  title={SKIPP’D: A SKy Images and Photovoltaic Power Generation Dataset for short-term solar forecasting},
+  author={Nie, Yuhao and Li, Xiatong and Scott, Andea and Sun, Yuchi and Venugopal, Vignesh and Brandt, Adam},
+  journal={Solar Energy},
+  volume={255},
+  pages={171--179},
+  year={2023},
+  publisher={Elsevier}
+}