Physics Letters A
Physics Letters A > 2016 > 380 > 1-2 > 299-303
Physics Letters A > 2016 > 380 > 4 > 614-620
Physics Letters A > 2016 > 380 > 42 > 3564-3569
Physics Letters A > 2016 > 380 > 1-2 > 299-303
Physics Letters A > 2016 > 380 > 4 > 614-620
Physics Letters A > 2016 > 380 > 42 > 3564-3569