Noor Alam, Noor Mohammad Khan A note on Isabel’s Zigzag Theorem for commutative semigroups Algebra Lett., 1 (2012), 22-27 PDF
Rauhi I. Elkhatib The maximal subgroups of the unitary group PSU(6, q), where q=2^k Algebra Lett., 1 (2012), 1-21 PDF