2007-736X 2007-736X S2007-736X2018000200371 10.24201/clecm.v5i2.121 Spain 00 12 2018 00 12 2018 5 2 371 396 1974 1987 1994 1995 1999 2016 2006 2008 1991 2000 1984 1959 15 15 1967 32 32 1968