“…This is well illustrated by the work of Shäfke and Singer in [37] which gives a new proof of a conjecture of Loxton and van der Poorten — previously established by Adamczewski and Bell in [1] — and therefore, a new proof of Cobham's theorem in automata theory by using tools coming from the theory of functional equations. Here are some references [1–8, 10, 11, 13–19, 21, 22, 26, 28–38].…”