Universal forms for one-dimensional quantum Hamiltonians: a comparison of the SUSY and the de la Peña factorization approaches. Canderle, L.; Plastino, A.; Casas, M.; Plastino, A.R. — 2009 International Journal of Mathematics and Mathematical Sciences
Stem extensions and stem covers of Leibniz algebras. Casas, J. M.; Ladra, M. — 2002 Georgian Mathematical Journal
Derivations of crossed modules. A. M. Vieites Rodríguez; J. M. Casas Mirás — 1999 Extracta Mathematicae