Nonlinear dimensionality reduction: Alternative ordination approaches for extracting and visualizing biodiversity patterns in tropical montane forest vegetation data. - Miguel D. Mahecha; Alfredo Martínez; Gunnar Lischeid; Erwin Beck (Ecol. Informatics, 2007)

Mapping Two Competing Grassland Species from a Low-Altitude Helium Balloon. - Brenner Silva; Lukas W. Lehnert; Kristin Roos; Andreas Fries; Rutger Rollenbeck; Erwin Beck; Jörg Bendix (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2014)