The following publications are possibly variants of this publication:
- Tramp ship routing and scheduling with voyage separation requirementsCharlotte Vilhelmsen, Richard Martin Lusby, Jesper Larsen. ors, 39(4):913-943, 2017. [doi]
- Full-shipload tramp ship routing and scheduling with variable speedsMin Wen, Stefan Ropke, Hanne L. Petersen, R. Larsen, Oli B. G. Madsen. cor, 70:1-8, 2016. [doi]