1. A design guide for road traffic noise;Ljunggren,1973
2. Zur Ausbreitung des Mittelungspegels von Strassenverkersgeräuschen in horizontalen unbebauten Gelände;Ullrich;Kampf dem Lärm,1977
3. The relationship between the noise emitted by a single moving source and the distance in open space;Makarewicz;Acoustics Letters,1979
4. Propagation of noise generated by a single moving source in open space;Jarzecki;Archives of Acoustics,1982
5. A calculation method of noise propagation over various ground surfaces from random traffic flow;Watanabe,1986