Update README.md

limitx0 · Feb 9, 2023 · 6d117ce · 6d117ce
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 - Rendering (Matlab): tools to render EEG data over a scalp.
 
 ## External resources.
-An RNN-type BCG artifact suppression method can be found [here](https://github.com/jiaangyao/BCGNet)
+- A conventional PCA-based BCG suppression method using [Optimal Basis Sets (OBS)](https://www.sciencedirect.com/science/article/abs/pii/S1053811905004726?via%3Dihub).
+- An RNN-type BCG artifact suppression method can be found [here](https://github.com/jiaangyao/BCGNet)
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