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2. Suicide;Durkheim,1951
3. Status Integration and Suicide: A Sociological Study;Gibbs,1964
4. The violation of fertility norms: voluntary childlessness as deviant behavior;Veevers,1972
5. Childlessness, intentional and unintentional: Psychological and social aspects;Pohlman;J. Nerv. Ment. Dis.,1970