INFLUENCE OF SMOOTHNESS AND DISCRETISATION PARAMETERS ON THE ACCURACY OF NUMERICAL INTEGRATION OF TWO-DIMENSIONAL HIGHLY OSCILLATORY FUNCTIONS. - Nechuiviter, O. P.; Khurdei, Y. L.; Ivanov, V. V.; Shnitsar, A. S.; Hishchak, O. R.; Zabornyi, A. V.; Letuta, A. A. (Radio Electronics, Computer Science, Control, 2026)