diff --git a/README.md b/README.md
index c72b7ccd..0f8ef601 100644
--- a/README.md
+++ b/README.md
@@ -17,20 +17,43 @@ the same terms as the Perl 5 programming language system itself.
 ## References ##
 
  - W. Luis Mochán, Guillermo P. Ortiz, and Bernardo S. Mendoza,
-*Efficient homogenization procedure for the calculation of optical properties of 3D nanostructured composites*,
-Optics Express **18** (21) 22119-22127 (2010).
-doi:10.1364/OE.18.022119
+   *Efficient homogenization procedure for the calculation of optical
+   properties of 3D nanostructured composites*,  Optics Express **18**
+   (21) 22119-22127 (2010). doi:10.1364/OE.18.022119
+
+ - E. Cortes, L. Mochán, B. S. Mendoza, and G. P. Ortiz, *Optical
+   properties of nanostructured metamaterials*, physica status solidi
+   (b) **247**, 2102 (2010).
+
+ - B. S. Mendoza and W. L. Mochán, *Birefringent nanostructured
+   composite materials*, Phys. Rev. B **85**, 125418 (2012).
 
  - J.S. Pérez-Huerta, Guillermo P. Ortiz, Bernardo S. Mendoza, and
-   W. Luis Mochán,
-*Macroscopic optical response and photonic bands*,
-New Journal of Physics {\bf 15}(4), 043037 (2013).
-doi:10.1088/1367-2630/15/4/043037
+   W. Luis Mochán, *Macroscopic optical response and photonic bands*,
+   New Journal of Physics **15**, 043037
+   (2013). doi:10.1088/1367-2630/15/4/043037
+
+ - B. S. Mendoza and W. L. Mochán, *Tailored optical polarization in
+   nanostructured metamaterials*, Phys. Rev. B **94**, 195137 (2016).
+
+ - U. R. Meza, B. S. Mendoza, and W. L. Mochán, *Second-harmonic
+   generation in nanostructured metamaterials*, Phys. Rev. B **99**,
+   125408 (2019).
+
+ - L. Juárez-Reyes and W. L. Mochán, *Magnetic Response of
+   Metamaterials*, physica status solidi (b) **255**, 1700495 (2018).
+
+ - W. L. Mochán, R. Singla, L. Juárez, and G. P. Ortiz, *Recursive
+   Calculation of the Optical Response of Multicomponent
+   Metamaterials*, physica status solidi (b) **257**, 1900560 (2020).
 
 ## Authors ##
 
   - W. Luis Mochán
   - Guillermo P. Ortiz
+
+## Contributors ##
+
   - Bernardo S. Mendoza
   - Lucila Juárez-Reyes
   - José Samuel Pérez-Huerta
@@ -40,5 +63,5 @@ doi:10.1088/1367-2630/15/4/043037
 ## Acknowledgments ##
 
 This work was partially supported by DGAPA-UNAM under grants IN108413,
-IN113016 and IN111119. We are grateful to *Mohawk2* for his many
+IN113016, IN111119, and IN109822/. We are grateful to *Mohawk2* for his many
 suggestions and contributions.