A corrector for a wave problem with periodic coefficients in a 1D bounded domain Juan Casado-Díaz, Julio Couce-Calvo, Faustino Maestre and José D. Martín-Gómez ESAIM: COCV, 21 2 (2015) 465-486 Published online: 04 March 2015 DOI: 10.1051/cocv/2014034