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%T The use of protest event data in comparative research: cross-national comparability, sampling methods and robustness %A Koopmans, Ruud %E Rucht, Dieter %E Koopmans, Ruud %E Neidhardt, Friedhelm %P 90-110 %D 1998 %I Ed. Sigma %@ 3-89404-182-X %C DEU %C Berlin %G en %9 Sammelwerksbeitrag %W GESIS - http://www.gesis.org %~ SSOAR - http://www.ssoar.info