0379-3982 0379-3982 S0379-39822018000100144 10.18845/tm.v31i1.3504 Costa Rica Costa Rica 00 03 2018 00 03 2018 31 1 144 159

[1 ] 2007 445-455. [2 ] 2013 63-79 [3 ] 2000 137 1 1 73-8 [4 ] 1991 26 1320-2 [ 5 ] 2013 26 3-8 [6 ] 2016 29 77-84 [7 ] 1980 30 421-7 [8 ] 2010 50 [9 ] 2014 28 [10 ] 2008 1 3ed 29-64 [11 ] 2007 52 2 2 46-52 [12 ] 2007 20 1 1 98-103 [13 ] 2010 21 2 2 327-31 [14 ] 2000 24 1 1 75-80 [15 ] 2017 128 487-508 [16 ] 2011 21-41 [17 ] 2004 [18 ] Cristal Chemical [19 ] Grupo Ox 2000 [20 ] 2017 1-2 [21 ] Anon 2017 [22 ] 1995 9 2-27-30 [23 ] 2013 [24 ] 2014 72 17-27 [25 ] 2007 1 41-5 [26 ] 2015 121 435-43 [27 ] 2009 99 5 5 17-25 [28 ] 2015 29 5 5 1365-80 [29 ] 2005 37 2 2 93-103 [30 ] 1990 49-84 [31 ] 1991 47 1 1 107-13 [ 32 ] 2015 17 24-31 [33 ] 2002 69 3 3 215-31 [34 ] 2009 26 63-8 [35 ] 2013 35 99 99 135-44