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, 1990a, Georg Simmel and the study of modernity, in M. Kaern, B. S. Phillips & R. S. Cohen (eds.), Georg Simmel and contemporary sociology, Dordrecht, Springer, pp. 57-74.
, 1990b, Georg Simmel's concept of society, in M. Kaern, B. S. Phillips & R. S. Cohen (eds.), Georg Simmel and contemporary sociology, Dordrecht, Springer, pp. 39-55.