, 2020, Early analytic philosophy and the German philosophical tradition, Bloomsbury, London.
, 2013a, Carl Hempel: whose philosopher?, in N. Milkov & V. Peckhaus (eds.), The Berlin group and the philosophy of logical empiricism, Dordrecht, Springer, pp. 293-309.
, 2013b, The Berlin group and the Vienna circle: affinities and divergences, in N. Milkov & V. Peckhaus (eds.), The Berlin group and the philosophy of logical empiricism, Dordrecht, Springer, pp. 3-32.
with Peckhaus, V. (eds) , 2013, The Berlin group and the philosophy of logical empiricism, Springer, Dordrecht.
, 2012, The construction of the logical world: Frege and Wittgenstein on fixing boundaries of human thought, in A. Dunshirn, E. Nemeth & G. Unterthurner (eds.), Crossing Borders, Wien, Oesterreichische Gesellschaft für Philosophie, pp. 151-162.
, 2006, Hermann Lotze's microcosm, in , Islamic philosophy and occidental phenomenology on the perennial issue of microcosm and macrocosm, Dordrecht, Springer, pp. 41-65.
, 2004, 'G. E. Moore and the Greifswald objectivists on the given and the beginning of analytic philosophy', Axiomathes 14 (4), 361-379.
, 2003, Susan Stebbing's criticism of Wittgenstein's Tractatus, in F. Stadler (ed.), The Vienna circle and logical empiricism, Dordrecht, Springer, pp. 351-363.
, 2001a, 'Political philosophy in Bulgaria – a fresh start?', Studies in East European Thought 53 (1-2), 145-156.