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<H2><A ID="SECTION00057000000000000000">
4.7 Phonons from DFPT+<I>U</I></A>
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<P>
The extension of DFPT to inlcude Hubbard <I>U</I> correction is described
in the following papers:
<P>
A. Floris, S. de Gironcoli, E. K. U. Gross, M. Cococcioni, Phys. Rev. B <B>84</B>,
161102(R), (2011);
<P>
A. Floris, I. Timrov, B. Himmetoglu, N. Marzari, S. de Gironcoli, and M. Cococcioni,
Phys. Rev. B <B>101</B>, 064305 (2020).
<P>
See example <code>PHonon/example/example18/</code>.
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