0103-6831 0103-6831 S0103-68312017000200572 10.18222/eae.v28i68.4752 Brazil 00 05 2017 00 05 2017 28 68 572 598

2001 22 75 75 15-32 2014 19 2 2 487-507 2009 9 9 71-8 1998 24 1 1 37-69 2005 26 92 92 911-33 2014 19 2 2 407-20