@article {482, title = {On the convergence of series of martingale differences with multidimensional indices}, journal = {J. Korean Math. Soc.}, volume = {52}, year = {2015}, pages = {1023-1036}, chapter = {1023}, url = {http://jkms.kms.or.kr/journal/list.html?Vol=52\&Num=5\&mod=vol\&book=JKMS\&aut_box=Y\&sub_box=Y\&pub_box=Y}, author = {Ta Cong Son and Dang Hung Thang} }