@techreport{TUW-199283, author = {Meraner, Angelika and Filzmoser, Peter and Templ, Matthias}, title = {Robust methods for semi-continuous data}, institution = {E105 - Institute of Statistics and Mathematical Methods in Economics; Vienna University of Technology}, year = {2011}, number = {Europ. Commission,FP7-SSH-2007-21732,WP4-D4.2-12} }