Frost, Robert, review of Ijäs, Miia, ‘Res publica’ Redefined? The Polish-Lithuanian Transition Period of the 1560s and 1570s in the Context of European State Formation Processes, in Slavonic and East European Review, 95.3 (2017), pp. 558–60, doi:10.5699/slaveasteurorev2.95.3.0558