0871-9187
0871-9187
S0871-91872021000200064
10.21814/rpe.18618
Portugal
30
12
2021
30
12
2021
34
2
64
85
[
1999
]
[
2004
17
2
2
49-83
]
[
2006
]
[
1996
]
[
1963
]
[
1980
301-28
]
[
1959
150-67
]
[
2007
7
2
2
71-7
]
[
1992
]
[
1997
]
[
2006
3-7
]
[
2017
214-58
]
[
2002
25-96
]
[
1986
]
[
2018
]
[
2014
]
[
2004
]
[
2005
1-12
]
[
2002
97-132
]
[
1996
6
173-8
]
[
1976
21
1
1
1-19
]