@misc{1175241, author = {William C Daywitt}, title = {Horn design equations for the NBS horn-type noise standards:}, year = {1987}, month = {1987-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NBS.IR.87-3073}, language = {en}, }