1. Halls for Music Performance: Two deacades of experience“, R.H.Talaske, B.S.Wetherill and W.J.Cavanaugh (eds ), (1982), American Institute of Physics for ASA;
2. P.H.Parkin, JASA, 48, (1970), p1025
3. S.H.de Koning, Philips Technical Review, Vol 41, (1983/84), p12
4. A.Krokstad, Trondheim NTH, Report No 408507, (1985)
5. D. de Vries and A.J.Berkhout,13 ICA 1989 Vo12 p261