@article {van Willigenburg:1981:0736-2935:443, title = "Rating of sound insulation by means of A-level reductions", journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings", parent_itemid = "infobike://ince/incecp", publishercode ="ince", year = "1981", volume = "1981", number = "4", publication date ="1981-10-06T00:00:00", pages = "443-448", itemtype = "ARTICLE", issn = "0736-2935", url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/1981/00001981/00000004/art00096", keyword = "69, 51.3", author = "van Willigenburg, J.J. and Nierop, C.A.", abstract = "", }