[1] J. Adámek, J. Rosický: 
Intersections of reflective subcategories. Proc. Amer. Math. Soc. 103 (1988), 710-712. 
MR 0947643 
[2] J. Adámek J. Rosický, V. Trnková: 
Are all limit-closed subcategories of locally presentable categories reflective?. Proc. Categ. Conf. Louvain-La-Neuve., Lecture Notes in Math. 1348, Springer-Verlag 1988, 1-18. 
MR 0975956 
[3] F. Borceux, G. M. Kelly: 
On locales of localizations. Jour. Pure Appl. Alg. 46 (1987), 1-34. 
MR 0894389 | 
Zbl 0614.18005 
[4] S. Fakir: 
Objects algébriquement clos et injectifs dans les catégories localement présentables. Bull. Soc. Math. France, Mem. 42 (1975). 
MR 0401879 
[5] E. R. Fisher: Vopěnka's principle, universal algebra and category theory. preprint 1987.
[6] P. Gabriel, F. Ulmer: 
Lokal prasentierbare Kategorien. Lect. Notes in Math. 221, Springer-Verlag 1971. 
MR 0327863 
[8] M. Makkai, A. M. Pitts: 
Some results on locally finitely presentable categories. Trans. Amer. Math. Soc. 299 (1987), 473-496. 
MR 0869216 | 
Zbl 0615.18002 
[9] J. Rosický V. Trnková, J. Adámek: 
Unexpected properties of locally presentable categories. to appear in Alg. Univ. 
MR 1037859 
[10] H. Volger: 
Preservation theorems for limits of structures and global sections of sheaves of structures. Math. Z. 166 (1979), 27-53. 
MR 0526864 | 
Zbl 0379.02020