Physics Letters A
Physics Letters A > 2016 > 380 > 4 > 554-561
Physics Letters A > 2016 > 380 > 7-8 > 848-855
Physics Letters A > 2016 > 380 > 31-32 > 2349-2353
Physics Letters A > 2016 > 380 > 4 > 554-561
Physics Letters A > 2016 > 380 > 7-8 > 848-855
Physics Letters A > 2016 > 380 > 31-32 > 2349-2353