Vietnam Journal of Mathematics
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 297-307
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 487-507
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 367-386
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 355-365
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 309-325
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 403-415
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 431-442
Vietnam Journal of Mathematics > 2019 > 47 > 2 > 477-485
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 639-657
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 527-545
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 547-561
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 617-638
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 599-615
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 563-577
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 733-756
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 715-731
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 683-713
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 659-667
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 757-768