Functorial approach structures Guillaume C.L. Brümmer | M. Sioen | Show more Guillaume C.L. Brümmer South Africa University of Cape Town Department of Mathematics and Applied Mathematics M. Sioen Belgium Free University of Brussels Department of Mathematics Submitted: 2013-12-11 | Accepted: 2013-12-11 | Published: 2003-04-01 DOI: https://doi.org/10.4995/agt.2003.2012