Physics Letters A
Physics Letters A > 2014 > 378 > 10 > 851-855
Physics Letters A > 2014 > 378 > 20 > 1388-1391
Physics Letters A > 2014 > 378 > 20 > 1428-1433
Physics Letters A > 2014 > 378 > 10 > 851-855
Physics Letters A > 2014 > 378 > 20 > 1388-1391
Physics Letters A > 2014 > 378 > 20 > 1428-1433