A new paper has been accepted for publication and is now online on the The Chemical Physics Letters website. The article “Planar tetracoordinate carbon in CE42 (E=AlTl) clusters” by Abril Carolina Castro, Martha Audiffred, Jose M. Mercero, Jesus M. Ugalde, Miguel A. Mndez-Rojas, Gabriel Merino can now be accessed at doi: 10.1016/j.cplett.2011.11.030