CC-Groups with periodic central factor. Miguel Ganzález; J. Otal; J.M. Pena — 1990 Manuscripta mathematica
LDU decompositions with L and U well conditioned. Peña, J.M. — 2004 ETNA. Electronic Transactions on Numerical Analysis [electronic only]
Loewner matrix ordering in estimation of the smallest singular value. Pena, J.M.; Szulc, T. — 2011 ELA. The Electronic Journal of Linear Algebra [electronic only]