00281nas a2200121Ia 4500008004100000040001000041041000700051044000700058082001200065245001100077260005800088300001300146160115c99999999ec |||||||||||| ||spa|| aCCENA aEs aEC aHN17011 aSophia aQuitobUniversidad Politécnica Salesianacdic. 2011 aNº (11)