@incollection{13150, author = {Christen, G. and Höchli, D. and Dombois, F. and Höldrich, R. }, title = {Haben Sie bereits Antworten ?}, publisher = {HKB Verlag}, year = {2009} ,address = {Bern (Schweiz)} ,month = 03 ,note = {procedure: without peer reviewing} }