Canonical and op-canonical lax algebras. Seal, Gavin J. — 2005 Theory and Applications of Categories [electronic only]
Morphisms of polar spaces. Faure, Claude-Alain; Seal, Gavin J. — 2004 Beiträge zur Algebra und Geometrie
Extensions in the theory of lax algebras. Schubert, Christoph; Seal, Gavin J. — 2008 Theory and Applications of Categories [electronic only]