Dovgoshey, O.; Martio, O.; Ryazanov, V.; Vuorinen, M.
(Український математичний вісник, 2004)
Let b be a complex number with |b| > 1 and let D be a finite subset of the complex plane C such that 0 ∊ D and card D ≥ 2. A number z is representable by the system (D, b) if z = Σajbj , where aj ∊ D. We denote by F the ...