@Unpublished{MMSV03a, author = {Maggio, F. and Massidda, L. and Siddi, G. and Vallascas, M.}, title = {A spectral element solvers for large scale acoustic problems: first results}, month = {april}, year = {2003}, note = {idxproject: lab-prj MSS}, url = {https://publications.crs4.it/pubdocs/2003/MMSV03a}, }