Physics Letters A
Physics Letters A > 2017 > 381 > 15 > 1313-1320
Physics Letters A > 2017 > 381 > 21 > 1815-1819
Physics Letters A > 2017 > 381 > 22 > 1910-1914
Physics Letters A > 2017 > 381 > 32 > 2636-2642
Physics Letters A > 2017 > 381 > 35 > 2986-2992