1. On the ice resistance encountered by ships operating in the continous mode of icebreaking;Enkvist,1972
2. Ship resistance to continuous motion in ice;Milano;Trans. Soc. Nav. Archit. Mar. Eng.,1973
3. Predicting ship performance in level ice;Kotras;Trans. Soc. Nav. Archit. Mar. Eng.,1984
4. A straightforward method for calculation of ice resistance of ships;Lindqvist,1989
5. Performance of merchant vessels in ice in the Baltic;Riska,1997