@article {de Graaf:2004:0736-2935:2160, title = "Statistical analysis of ambient sound levels from long-term outdoor measurements", journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings", parent_itemid = "infobike://ince/incecp", publishercode ="ince", year = "2004", volume = "2004", number = "5", publication date ="2004-08-22T00:00:00", pages = "2160-2165", itemtype = "ARTICLE", issn = "0736-2935", url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2004/00002004/00000005/art00012", keyword = "52.1, 24", author = "de Graaf, Richard", abstract = "", }