April 1 – September 30 1997: for the study of Models of Backscattering from Earth’s Surface – research project Innovative Algorithms and Architectures for Interferometric SAR (funded by ASI), Department of Electronic Engineering, University of Naples “Federico II”, supervisor Prof. F. Palmieri
February 1 – October 31, 1999: for the study of Statistical Processing Techniques for Information Retrieval from Remotely Sensed Data, University of Salerno, supervisor Prof. M. Longo