On Hadamard-Dirichlet algebras. Barrenechea, A.L.; Peña, C.C. — 2002 Acta Mathematica Universitatis Comenianae. New Series
Some observations concerning the non-existence of bounded differentials on weighted ℓ 1 algebras. Barrenechea, A.L.; Pena, C.C. — 2003 Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]
On innerness of derivations on S ( ℋ ) . Barrenechea, A.L.; Peña, C.C. — 2005 Lobachevskii Journal of Mathematics