The Berlin Group and the Philosophy of Logical Empiricism
N. Milkov, V. Peckhaus, eds., The Berlin Group and the Philosophy of Logical Empiricism, 1st ed., Springer Verlag , Dordrecht, 2013.

The Berlin Group and the Vienna Circle: Affinities and Divergences
N. Milkov, in: N. Milkov, V. Peckhaus (Eds.), The Berlin Group and the Philosophy of Logical Empiricism, 1st ed., Springer, Berlin, 2013, pp. 3–32.

Carl Hempel: Whose Philosopher
N. Milkov, in: N. Milkov (Ed.), The Berlin Group and the Philosophy of Logical Empiricism, 1st ed., Springer, Berlin, 2013, pp. 293–310.