Nobel P. S., Responses of some North American CAM plants to freezing temperatures and doubled CO₂ concentrations — implications of global climate change for extending cultivation, Journal of Arid Environments, 1996, 34(2):187-196, doi: 10.1006/jare.1996.0100
The paper describes controlled cooling of cactus tissues and cell viability assessment. It considers physiological results in the climate context adopted during the study.