Definition and Evaluation of the Spatio-Temporal Variations in Chlorophyll Fluorescence during the Phases of CAM and during Endogenous Rhythms in Continuous Light, in Thick Leaves of Kalanchoë daigremontiana - Maddess , T; Rascher , U; Siebke , K; Lüttge , U; Osmond , B (Plant Biology, 2002)