0122-7483 0122-7483 S0122-74832018000100009 10.11144/javeriana.sc23-1.bosa Jordan 00 04 2018 00 04 2018 23 1 9 20

[1] 1999 [2] 2002 11 829-38 [3] 2003 9 169-79 [4] 2003 12 119-31 [5] 1971 22 99-112 [6] 1982 16 65-78 [7] 1963 70 36-41