Physics Letters A
Physics Letters A > 2016 > 380 > 3 > 495-501
Physics Letters A > 2016 > 380 > 16 > 1401-1407
Physics Letters A > 2016 > 380 > 21 > 1877-1883
Physics Letters A > 2016 > 380 > 38 > 3133-3137
Physics Letters A > 2016 > 380 > 41 > 3421-3429