Physics Letters A
Physics Letters A > 2017 > 381 > 10 > 924-930
Physics Letters A > 2017 > 381 > 18 > 1611-1614
Physics Letters A > 2017 > 381 > 40 > 3514-3518
Physics Letters A > 2017 > 381 > 10 > 924-930
Physics Letters A > 2017 > 381 > 18 > 1611-1614
Physics Letters A > 2017 > 381 > 40 > 3514-3518