diff --git a/fig/external/other/e3nn/reference.txt b/fig/external/other/e3nn/reference.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9dca8279178770bc5f8170069db1e677a170a7ed
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+++ b/fig/external/other/e3nn/reference.txt
@@ -0,0 +1,4 @@
+training-with-rotational-symmetry, training-without-rotational-symmetry:
+e3nn.org/mrs > tutorial 1 > slides > page 12
+https://docs.google.com/presentation/d/1y-fCZihLoSBgAqNYKZY1-jy8qpvqagqPTsX-jR0uTm8/edit#slide=id.gfc16e347b8_0_535
+author: tess smidt. 
diff --git a/fig/external/other/e3nn/training-with-rotational-symmetry.pdf b/fig/external/other/e3nn/training-with-rotational-symmetry.pdf
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+version https://git-lfs.github.com/spec/v1
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+size 915782
diff --git a/fig/external/other/e3nn/training-with-rotational-symmetry.svg b/fig/external/other/e3nn/training-with-rotational-symmetry.svg
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diff --git a/fig/external/other/e3nn/training-without-rotational-symmetry.pdf b/fig/external/other/e3nn/training-without-rotational-symmetry.pdf
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+version https://git-lfs.github.com/spec/v1
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diff --git a/fig/external/other/e3nn/training-without-rotational-symmetry.svg b/fig/external/other/e3nn/training-without-rotational-symmetry.svg
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