Vietnam Journal of Mathematics
Vietnam Journal of Mathematics > 2014 > 42 > 4 > 543-566
Vietnam Journal of Mathematics > 2015 > 43 > 2 > 471-486
Vietnam Journal of Mathematics > 2018 > 46 > 1 > 33-52
Vietnam Journal of Mathematics > 2018 > 46 > 2 > 293-328
Vietnam Journal of Mathematics > 2019 > 47 > 3 > 683-713