Palva, E. T.; Taehtiharju, S.; Tamminen, I.; Puhakainen, T.; Laitinen, R.; Svensson, J.; Helenius, E.; Heino, P.: Biological Mechanisms of Low Temperature Stress Responsse: Cold Acclimation and Development of Freezing Tolerance in Plants. (2002), 9-15 pp.