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One comment, two authors are missing in this article: Ruben Darío, Hector Flores A este articulo,publicación le hacen falta autores: Ruben Darío, Hector Flores Here is the reference, Aquí esta la referencia (Page 20): http://www.southernpoultrysciencesociety.org/pdfs/13ProgramGuide.pdf [...P132 Evaluation of recombinant HVT NDV vaccines in laying hens experimentally challenged with the ...