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@incollection{ Koopmans1998,
title = {The use of protest event data in comparative research: cross-national comparability, sampling methods and robustness},
author = {Koopmans, Ruud},
editor = {Rucht, Dieter and Koopmans, Ruud and Neidhardt, Friedhelm},
year = {1998},
booktitle = {Acts of dissent: new developments in the study of protest},
pages = {90-110},
address = {Berlin},
publisher = {Ed. Sigma},
isbn = {3-89404-182-X},
keywords = {internationaler Vergleich; international comparison; vergleichende Politikwissenschaft; comparative political science; Protest; protest; soziale Bewegung; social movement; Methode; method; Datengewinnung; data capture; Stichprobe; sample}}