Added reference to the paper

aeporreca · Feb 28, 2023 · 3111edf · 3111edf
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diff --git a/README.md b/README.md
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 A generator of functional digraphs up to isomorphism
 
+Based on Antonio E. Porreca, Ekaterina Timofeeva, Polynomial-delay generation of functional digraphs up to isomorphism, arXiv:2302.13832, 2023, https://doi.org/10.48550/arXiv.2302.13832
+
 ```
 usage: funkdigen.py [-h] [-c] [-t] size
 

diff --git a/funkdigen.py b/funkdigen.py
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 #!/usr/bin/env python3
 
+# A generator of functional digraphs up to isomorphism. Based on
+# Antonio E. Porreca, Ekaterina Timofeeva, Polynomial-delay generation
+# of functional digraphs up to isomorphism, arXiv:2302.13832, 2023,
+# https://doi.org/10.48550/arXiv.2302.13832
 
 from argparse import ArgumentParser
 from timeit import default_timer
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     A generator of functional digraphs up to isomorphism
+    Based on Antonio E. Porreca, Ekaterina Timofeeva, Polynomial-delay generation of functional digraphs up to isomorphism, arXiv:2302.13832, 2023, https://doi.org/10.48550/arXiv.2302.13832
     ```
     usage: funkdigen.py [-h] [-c] [-t] size
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