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## 4.7 Phonons from DFPT+U

The extension of DFPT to inlcude Hubbard U correction is described in the following papers:

A. Floris, S. de Gironcoli, E. K. U. Gross, M. Cococcioni, Phys. Rev. B 84, 161102(R), (2011);

A. Floris, I. Timrov, B. Himmetoglu, N. Marzari, S. de Gironcoli, and M. Cococcioni, Phys. Rev. B 101, 064305 (2020).

See example `PHonon/example/example18/`.