“…Based on these data, we find q(0, t). After, substitute the found expression for q(0, t) into equation (15), and solving the Cauchy problem for an arbitrary value τ , we find ξ n (τ, t), n ≥ 1. By the trace formula (16) we determine q(x, t) and then from the formula (17) we determine p 2 (x, t).…”