LIPPS, Oliver. Effects of different Incentives on Attrition and Fieldwork Effort in Telephone Household Panel Surveys. Survey Research Methods, [S. l.], v. 4, n. 2, p. 81–90, 2010. DOI: 10.18148/srm/2010.v4i2.3538. Disponível em: https://ojs.ub.uni-konstanz.de/srm/article/view/3538. Acesso em: 20 jul. 2024.