PB - University of Technology L1 - http://smp.pm.szczecin.pl/Content/2433/PMRes_2020_3.pdf L2 - http://smp.pm.szczecin.pl/Content/2433 ER - T1 - Polish Maritime Research. No 3(107) 2020 UR - http://smp.pm.szczecin.pl/dlibra/docmetadata?id=2433