@article {Kopec:1990:0736-2935:127, title = "Pushing the limits of acoustical barrier performance", journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings", parent_itemid = "infobike://ince/incecp", publishercode ="ince", year = "1990", volume = "1990", number = "1", publication date ="1990-10-15T00:00:00", pages = "127-132", itemtype = "ARTICLE", issn = "0736-2935", url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/1990/00001990/00000001/art00020", keyword = "31, 51.3", author = "Kopec, John W.", abstract = "", }