PB - University of Technology L1 - http://smp.pm.szczecin.pl/Content/1569/PMRes_2010_2.pdf L2 - http://smp.pm.szczecin.pl/Content/1569 ER - T1 - Polish Maritime Research. No 2 (64) 2010 UR - http://smp.pm.szczecin.pl/dlibra/docmetadata?id=1569