0120-6346
0120-6346
S0120-63462020000100263
10.22395/seec.v23n54a13
Poland
00
06
2020
00
06
2020
23
54
263
278
[
2003
45
]
[
1997
a
85-100
]
[
1997
b
208
]
[
2009
300
]
[
2006
256
]
[
2004
132-46
]
[
2010
6
1
1
51-61
]
[
2007
16
16
135-52
]
[
2018
41
4
4
95-112
]
[
2011
60
365-91
]
[
Ukosne
2020
]
[
2018
]