Physics Letters A
Physics Letters A > 2017 > 381 > 2 > 59-64
Physics Letters A > 2017 > 381 > 4 > 194-206
Physics Letters A > 2017 > 381 > 35 > 2906-2911
Physics Letters A > 2017 > 381 > 2 > 59-64
Physics Letters A > 2017 > 381 > 4 > 194-206
Physics Letters A > 2017 > 381 > 35 > 2906-2911