Schulze, Ernst Detlef MPI for Extraterrestrial Physics, Max Planck Society;
Nonami, H., Schulze, E. D., & Ziegler, H. (1990). Mechanisms of stomatal movement in response to air humidity, irradiance and xylem water potential. Planta, 183(1), 57-64. doi:10.1007/BF00197567.