00347nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000190010410000220012324500260014526000300017118851UR20220428191251.0061103|||||||||||||||||||||||||||||||| d  a(janium) 18840  a(janium)18839 4aR114b.P4 19971 aPerez Tamayo, Ruy10aArticulos cientificos  bEl Colegio Nacionalc1997