A. V. Zorin, N. P. Tret'yakov, “Calculation of transition probabilities in quantum mechanics with a nonnegative distribution function in the Maple computer algebra system”, Zh. Vychisl. Mat. Mat. Fiz., 60:1 (2020), 88–95; Comput. Math. Math. Phys., 60:1 (2020), 82–89
