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… de: http://www.cgfm.mil.co/CGFMPortal/Cgfm_files/Media/File/ …
… http://www1.udistrital.edu.co:8080/c/document_library/ get_file?uuid=976d2c91-cdbb-49cb-be9a-5ae24be403dc&groupId=12891 …
… arbor.revistas.csic.es/index.php/arbor/article/download/1046/1053 Franco, L. Ramírez, M. Vásquez, N. y …