Physics Letters A
Physics Letters A > 2014 > 378 > 20 > 1428-1433
Physics Letters A > 2014 > 378 > 34 > 2549-2552
Physics Letters A > 2014 > 378 > 40 > 2951-2958
Physics Letters A > 2014 > 378 > 20 > 1428-1433
Physics Letters A > 2014 > 378 > 34 > 2549-2552
Physics Letters A > 2014 > 378 > 40 > 2951-2958