Nobel P. S., Hartsock T. L., Physiological responses of Opuntia ficus-indica to growth temperature, Physiologia Plantarum, 1984, 60(1):98-105, doi: 10.1111/j.1399-3054.1984.tb04257.x
The experiment analyses effects of growth temperature on CO₂ uptake and night-time acid accumulation. It compares physiological responses of the cactus studied under different thermal conditions.