@article{EJDE_2002__2002__a146,
     author = {Nandakumaran,  A.K.},
     title = {Convergence of the boundary control for the wave equation in domains with holes of critical size},
     journal = {Electronic journal of differential equations},
     year = {2002},
     volume = {2002},
     zbl = {1007.35007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a146/}
}