diff --git a/fig/external/presentations/rwth-dft20/README.org b/fig/external/presentations/rwth-dft20/README.org
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+Lectures from the course "Density Functional Theory and Electronic Strucure",
+given in WS 2020/2021 by Prof. Stefan Blügel at RWTH Aachen University.
diff --git a/fig/external/presentations/rwth-dft20/lecture-20-kkr/Lecture20_KKRGF-Method.pdf b/fig/external/presentations/rwth-dft20/lecture-20-kkr/Lecture20_KKRGF-Method.pdf
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+++ b/fig/external/presentations/rwth-dft20/lecture-20-kkr/Lecture20_KKRGF-Method.pdf
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+version https://git-lfs.github.com/spec/v1
+oid sha256:32fd154e6eab0cc3b1aa50dfc675527355353d0e02222c724e76f9c7337cf1b9
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diff --git a/fig/external/presentations/rwth-dft20/lecture-20-kkr/README.org b/fig/external/presentations/rwth-dft20/lecture-20-kkr/README.org
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+KKR guest lecture given by [[https://scholar.google.com/citations?user=D7qvTVIAAAAJ][Phivos Mavropoulos]], National and Kapodistrian
+University of Athens, Physics Department, WS 2020 / 2021.