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2. Mechel, F.P. “Schallabsorber”, Vol. I, “Äußere Schallfelder, Wechselwirkungen”, Chap. 13 “Kugelwellen über Absorber-Ebene” S.Hirzel Verlag, Stuttgart, 1989; Vol. II, “Innere Schallfelder, Strukturen” S.Hirzel Verlag, Stuttgart, 1995; Vol. III, “Anwendungen”, S.Hirzel Verlag, Stuttgart, 1998
3. Mechel, F. P. (1999). Scattering at rigid building corners. Journal of Sound and Vibration, 219, 105–132.
4. Mechel, F. P. (1999). Improvement of corner shielding by an absorbing cylinder. Journal of Sound and Vibration, 219, 559–579.
5. Mechel, F. P. (1999). The scattering at a corner with absorbing flanks and an absorbing cylinder. Journal of Sound and Vibration, 219, 581–601.