Fricke, Hans Verhaltensphysiologie, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Fricke, H., Vareschi, E., & Schlichter, D. (1987). Photoecology of the coral Leptoseris fragilis in the Red Sea twilight zone (an experimental study by submersible). Oecologia, 73(3), 371-381. doi:10.1007/BF00385253.