0035-001X 0035-001X S0035-001X2019000400333 10.31349/revmexfis.65.333 Nigeria Nigeria 00 08 2019 00 08 2019 65 4 333 344

1 2015 2 1988 3 2019 4 2019 5 2013 51 976-91 6 2013 22 110301 7 2013 54 1753-2 8 2011 3 239-47 9 2017 3 1-7 10 2016 17 1-17 11 2013 91 98-104 12 2014 112 127-41 13 2007 76 92-6 14 2007 45 346-51 15 2007 107 540-4 16 2007 40 537-44 17 2012 50 788-94 18 2014 61 436 19 2014 35 3443 20 2015 56 185 21 2015 24 1550020-1 22 2016 54 968-77 23 2007 24 2008 323 1136-49 25 2009 42 035303 26 2011 83 025002 27 2012 38 51-9 28 2018 24 29 2018 73 1211-8 30 2014 1 2 31 2012 85 045009 32 2012 10 361 33 2013 22 060303 34 1997 63 949 35 2017 36 2017 34 110301 37 2011 38 2018 39 1935 3 61 40 1939 41 2012 42 2016 33 010303 43 1934 45 98 44 2004 70 94-7 45 2013 8 325 46 47 2012 53 487-98 48 2018 19 1-27 49 2018 50 2006 21 2087 51 2015 46 52 2013 59 229-35 53 2009 80 065304 54 2006 39 11521 55 2008 372 4779 56 2007 42 461 57 2009 39 307-14 58 2005