1646-5954
1646-5954
S1646-59542020000300036
10.15847/obsobs14320201622
Belgium
30
09
2020
30
09
2020
14
3
36
55
[
2006
36-58
]
[
2017
34
3
3
559-71
]
[
2010
1-19
]
[
2002
1-21
]
[
1991
]
[
2006
]
[
2012
33
6
6
1385-97
]
[
2003
53
2
2
282-99
]
[
2017
3
3
3
933-44
]
[
2009
9
2
2
87-100
]
[
2011
43
4
4
239-49
]
[
2015
1-17
]
[
2015
93-7
]
[
2006
313-28
]
[
2003
102
2-3
2-3
433-51
]
[
1992
3
19-24
]
[
2009
]
[
2005
28
1
1
1-19
]
[
2010
35-51
]
[
1991
95-121
]
[
2002
14
1
1
147-71
]
[
AICGS
2010
17-29
]
[
2009
25
5
5
291-302
]
[
2003
29-53
]
[
2014
24
3
3
450-70
]
[
2015
39
3
3
59-87
]
[
2017
]
[
2017
22
5
5
]
[
2012
6
1
1
87-105
]
[
2009
10
2
2
238-52
]
[
2007
5
4
4
223-39
]
[
2015
21
2
2
330-47
]
[
2015
18
1
1
70-85
]
[
2011
55
10
10
1294-318
]
[
2007
]
[
2002
84-105
]
[
2007
361-79
]
[
2014
63
6-7
6-7
490-504
]
[
2016
12
3
3
238-61
]
[
2015
175
515-21
]
[
2016
2
3
3
145-56
]
[
2017
229-45
]
[
2011
14
2
2
]
[
2018
25
3-4
3-4
636-53
]
[
2012
56
3
3
330-45
]
[
1999
1
2
2
21-3
]
[
2011
14
2
2
]
[
2003
]
[
2005
8
4
4
253-74
]
[
2015
]
[
2012
38
9
9
1469-85
]
[
2010
85-110
]
[
2011
105-24
]
[
2002
36
3
3
597-617
]
[
2013
18
3
3
129-67
]
[
2010
12
2
2
183-97
]
[
1996
10
2
2
248-54
]
[
1997
16
53-61
]
[
2006
9
4
4
497-518
]
[
2011
32
4
4
531-45
]
[
2015
1
1-2
1-2
172-90
]
[
2014
9
3
3
1641-51
]