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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}}