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@@ -55,7 +55,7 @@ Recommended Reading
* `Arduino Serial reference
<http://arduino.cc/en/Reference/Serial>`_
* ST `Reference Manual RM0008
- <http://www.st.com/stonline/products/literature/rm/13902.pdf>`_
+ <http://www.st.com/web/en/resource/technical/document/reference_manual/CD00171190.pdf>`_
(PDF), Chapter 27.
* `Serial and UART Tutorial
<http://www.freebsd.org/doc/en/articles/serial-uart/>`_ (written for