@article{ZNSL_1991_195_a11,
     author = {G. F. Roach},
     title = {Acoustic scattering by penertable bodies},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {113--137},
     publisher = {mathdoc},
     volume = {195},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_195_a11/}
}