0187-6236
0187-6236
S0187-62362017000100027
10.20937/atm.2017.30.01.03
South Africa
00
01
2017
00
01
2017
30
1
27
38
[
1998
434
]
[
2005
]
[
2014
27
385-401
]
[
1990
1326
196-206
]
[
2013
]
[
2013
135
05121
]
[
2014
]
[
2014
8971
]
[
2008
84
289-306
]
[
2001
]
[
1965
55
1427-31
]
[
1978
17
3755-62
]
[
1974
66
1237-47
]
[
1993
]
[
2015
]
[
2015
13
]
[
1975
14
^s1
^s1
1
]
[
2005
26
]
[
1990
]