Grams, Thorsten and Haag-Kerwer, and Olivares, and Ball, and Arndt, and Popp, and Medina, and Lüttge, (1997):
Comparative measurements of chlorophyll a fluorescence, acid accumulation and gas exchange in exposed and shaded plants of Clusia minor L and Clusia multiflora H.B.K. in the field.
In: Trees. 11 (1997), S. 240-247, [Article]

Grams, Thorsten and Haag-Kerwer, and Olivares, and Ball, and Arndt, and Popp, and Medina, and Lüttge, (1997):
On the mechanism of reinitiation of endogenous crassulacean acid metabolism rhythm by temperature changes.
In: Plant physiology. 113 (1997), S. 1309-1317, [Article]

Haag-Kerwer, A. and Grams, and Olivares, and Ball, and Arndt, and Popp, and Medina, and Lüttge, (1996):
Comparative measurements of gas-exchange, acid accumulation and chlorophyll fluorescence of different species of Clusia showing C3-photosynthesis, or crassulacean acid metabolism, at the same field site in Venezuela.
In: New phytologist. 134 (1996), S. 215-226, [Article]