Free subgroups in maximal subgroups of skew linear groups. - Bui Xuan Hai; Huynh Viet Khanh (Int. J. Algebra Comput., 2019)

On division subrings normalized by almost subnormal subgroups in division rings. - Trinh Thanh Deo; Mai Hoang Bien; Bui Xuan Hai (Period. Math. Hung., 2020)

Reversibility in matrix rings and group algebras. - Truong Huu Dung; Bui Xuan Hai; Tran Nam Son (Period. Math. Hung., 2025)