2393-6886 2393-6886 S2393-68862018000200061 10.29112/ruae.v3.n2.4 Peru Peru 00 12 2018 00 12 2018 3 2 61 71

1970 2012 1978 1976 1978 1982 1985 1990 1987 2009 1981 1945 1969 2004 39 39 37-80 1969