Images in categories as reflections Hans Ehrbar, Oswald Wyler (1987) Cahiers de Topologie et Géométrie Différentielle Catégoriques
Induction and restriction as adjoint functors on representations of locally compact groups. Bekes, Robert A., Hilton, Peter J. (1993) International Journal of Mathematics and Mathematical Sciences
Isbell duality. Barr, Michael, Kennison, John F., Raphael, R. (2008) Theory and Applications of Categories [electronic only]
Isbell duality for modules. Barr, Michael, Kennison, John F., Raphael, R. (2009) Theory and Applications of Categories [electronic only]