1. Lecture Notes Series of the London Mathematical Society;I Yaacov Ben,2008
2. Caicedo, X.: Conectivos sobre espacios topológicos. Rev. Acad. Colomb. Cienc. 21(81), 521–534 (1997)
3. Caicedo, X.: Lógica de los haces de estructuras. Rev. Acad. Colomb. Cienc. 19(74), 569–586 (1995)
4. Carson, A.B.: The model-completion of theory of commutative regular rings. J. Algebra 27, 136–146 (1973)
5. Comer, S.: Elementary properties of structures of sections. Bol. Soc. Mat. Mexicana. 19, 78–85 (1974)