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-rw-r--r--numpy/polynomial/chebyshev.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/polynomial/chebyshev.py b/numpy/polynomial/chebyshev.py
index 4ddb0c688..431617414 100644
--- a/numpy/polynomial/chebyshev.py
+++ b/numpy/polynomial/chebyshev.py
@@ -104,7 +104,7 @@ References
----------
.. [1] A. T. Benjamin, et al., "Combinatorial Trigonometry with Chebyshev
Polynomials," *Journal of Statistical Planning and Inference 14*, 2008
- (preprint: https://www.math.hmc.edu/~benjamin/papers/CombTrig.pdf, pg. 4)
+ (https://web.archive.org/web/20080221202153/https://www.math.hmc.edu/~benjamin/papers/CombTrig.pdf, pg. 4)
"""
import numpy as np