R. G. Bogotá

Ultra-high resolution pollen record from the northern Andes reveals rapid shifts in montane climates within the last two glacial cycles

T. van der Hammen, Martin Ziegler, Juan Carlos Berrio, 2011 .

Rapid shifts in South American montane climates driven by pCO2 and ice volume changes over the last two glacial cycles

O. Rangel, M. Ziegler, S. Weber, 2010 .

Rapid shifts in South American montane climates over the past 284000 years

O. Rangel, J. Plicht, M. Ziegler, 2010 .