Add electrodinàmica HW2

Change-Id: Icaf0fa41409dfaf79cf919fb20cbe3e7592f8123
diff --git a/quad9/electrodinamica/homework/hw2/referencies.bib b/quad9/electrodinamica/homework/hw2/referencies.bib
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+@article{2008583,
+  title = {Mesons},
+  journal = {Physics Letters B},
+  volume = {667},
+  number = {1},
+  pages = {583},
+  year = {2008},
+  note = {Review of Particle Physics},
+  issn = {0370-2693},
+  doi = {https://doi.org/10.1016/j.physletb.2008.07.042}
+}