Scientific Journal of Gdynia Maritime University
Scientific Journal of Gdynia Maritime University > 2021 > nr 119 > 20--30
Scientific Journal of Gdynia Maritime University > 2021 > nr 119 > 31--44
Scientific Journal of Gdynia Maritime University > 2021 > nr 119 > 45--53
Scientific Journal of Gdynia Maritime University > 2021 > nr 119 > 54--63