1. Adámek, J., Herrlich, H., Strecker, G.E.: Abstract and concrete categories: The joy of cats. Repr. Theory Appl. Categ. 17, 1–507 (2006)
2. Baker, K.A.: Free vector lattices. Canadian J. Math. 20, 58–66 (1968)
3. Banaschewski, B.: The real numbers in pointfree topology, Textos de Matemática. Série B [Texts in Mathematics. Series B], vol. 12, Universidade de Coimbra, Departamento de Matemática, Coimbra, (1997)
4. Banaschewski, B.: On the function ring functor in pointfree topology. Appl. Categ. Struct. 13(4), 305–328 (2005)
5. Beynon, W.M.: Combinatorial aspects of piecewise linear functions. J. London Math. Soc. 2(7), 719–727 (1974)