2215-2458 2215-2458 S2215-24582020000200013 10.15517/isucr.v21i44.43925 Costa Rica 00 12 2020 00 12 2020 21 44 13 39

1999 1972 1991 2004 1996 1980 1992 1963 1956 1959 1964 1961 1970 2006 2010 1971 1995 1989 2000 53 1 1 16-8 1987