1815-5901 1815-5901 S1815-59012019000100081 Angola 00 04 2019 00 04 2019 40 1 81 91

[1] 2011 [2] 2012 [3] 2015 [4] 2012 [5] 2013 [6] 2012 [7] 2016 [8] 2013 [9] 2011 [10] Institute of Electrical and Electronics Engineers, Inc. 2000 [11] 2000 14a [12] 2005 Segunda [13] 1995 3a [14] 2011