@unpublished{TUW-165419, author = {Valenta, Gerhard and Loibnegger, Friedrich}, title = {Investigations of Fractures of Rails at Vienna Underground and Measures to reduce them}, year = {2007}, note = {talk: 50th UITP meeting; Underground Subcommittee Fixed Instalations, Glasgow; 2007-11-07 -- 2007-11-09} }