From 2b32b53b3f0594e08f4dac4074c3c4a3295f762d Mon Sep 17 00:00:00 2001
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 <34062895+keddad@users.noreply.github.com>
Date: Sun, 14 Jul 2019 19:30:43 +0000
Subject: [PATCH] Update README.md (#555)

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 ## External Papers
 
-[A tutorial on hidden Markov models and selected applications in speech recognition](http://luthuli.cs.uiuc.edu/~daf/courses/Signals%20AI/Papers/HMMs/0.pdf)
+[A tutorial on hidden Markov models and selected applications in speech recognition](http://www.cs.cmu.edu/~cga/behavior/rabiner1.pdf)
 
 [Weighted Finite-State Transducers in Speech Recognition](http://www.cs.nyu.edu/~mohri/pub/csl01.pdf)