“…In [32], Peterson and Thompson introduced a more general concept of integral, i.e., the HK ∆ -integral, which gives a common generalization of the Riemann ∆ and Lebesgue ∆ -integral. The theory of HK integration for real-valued and vectorvalued functions on time scales has been developed rather intensively, see, e.g., the papers [1,11,16,28,29,33,37,40,44] and references cited therein.…”