@article{JEDP_1991____A13_0, author = {Beals, Michael and Strauss, Walter}, title = {Time decay estimates for a perturbed wave equation}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {13}, publisher = {Ecole polytechnique}, year = {1991}, zbl = {0754.35078}, mrnumber = {1132234}, language = {en}, url = {http://www.numdam.org/item/JEDP_1991____A13_0/} }