9Zabadal T, Dami I E, Goffinet M, Martinson T, Chien M. Winter injury to grapevines and methods of protection. Michigan State University, East Lansing. Extension Bulletin E2930, 2007.
10Warmund M R, Guinan P, Fernandez G. Temperatures and cold damage to small fruit crops across the eastern U.S. associated with the April 2007 freeze. HortScience,2008, 43: 1-5.