1646-5954
1646-5954
S1646-59542020000400021
10.15847/obsobs14420201656
Portugal
Portugal
30
12
2020
30
12
2020
14
4
21
41
[
2009
]
[
AENOR
2005
]
[
AENOR
2012
]
[
2011
]
[
2014
7-22
]
[
1993
]
[
2016
]
[
2017
17
31
31
29-42
]
[
2015
244-60
]
[
2019
6
37-53
]
[
CNLSE
2017
]
[
2003
]
[
1984
]
[
2014
]
[
2003
]
[
ERC
2016
]
[
2019
]
[
1998
]
[
2013
]
[
2015
277-98
]
[
2004
49
1
1
81-8
]
[
1985
]
[
2003
]
[
2010
324-8
]
[
2008
]
[
2016
18
166-89
]
[
2015
112-3
]
[
2017
]
[
2015
]
[
1990
]
[
2007
12
95-114
]
[
2008
171-90
]
[
2009
151-69
]
[
Observador.pt
2019
]
[
2012
Lisboa
]
[
2010
213-26
]
[
2007
23-51
]
[
2012
]
[
2008
191-8
]
[
2016
]
[
2008
2
1
1
«-34
]