Essentiality and Injectivity. - Hasan Barzegar; Mohammad Mehdi Ebrahimi; Mojgan Mahmoudi (Appl. Categorical Struct., 2010)

Permanents of Hexagonal and Armchair Chains. - O. Nekooei; Hasan Barzegar; A. R. Ashrafi (Int. J. Math. Math. Sci., 2022)