@article{Abian:69163,
      author        = "Abian,O. and Grazú,V. and Hermoso,J. and González,R. and
                       García,J. L. and Fernández-Lafuente,R. and Guisán,J. M.",
      title         = "{Stabilization of Penicillin G Acylase from Escherichia
                       coli: Site-Directed Mutagenesis of the Protein Surface to
                       Increase Multipoint Covalent Attachment}",
      year          = "2004",
}