0034-7426 0034-7426 S0034-74262017000200241 Colombia 00 12 2017 00 12 2017 51 2 241 257

[1] 2002 324 3 3 491-519 [2] 2007 51 30-51 [3] [4] 1986 71 237-62 [5] 2016 37 1 1 75-9