Burton MJ, Doree C.
Ear drops for the removal of ear wax
Cochrane Database of Systematic Reviews 2009, Issue 1.
Gotas óticas para la eliminación del cerumen (Revision Cochrane traducida).
En: Biblioteca Cochrane Plus 2009 Número 2.

Clegg AJ, Loveman E, Gospodarevskaya E, Harris P, Bird A, Bryant J, Scott DA, Davidson P, Little P, Coppin R.  
The safety and effectiveness of different methods of ear wax removal: a systematic review and economic evaluation. 
Health Technology Assessment 2010; 14(28): 1-192

Does irrigation of the ear to remove impacted wax improve hearing?.Williams D.British Journal of Community Nursing 2005; 10(5): 228-232. DARE.

The effectiveness of topical preparations for the treatment of earwax: a systematic review. 2004. Hand C, Harvey I. British Journal of General Practice, 2004;54:862-867. DARE

The most effective products available to facilitate ear syringing. 2002.  Somerville G. British Journal of Community Nursing, 2002;7(2):94-101. DARE