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appeared in: Operator Caculus and Spectral Theory, M. Demuth, B.Gramsch, B.-W.Schulze eds., Operator Theory: Advances and Applications Vol. 57, Birkhäuser, Basel etc. 1992, pp. 61 - 70; ISBN 3-7643-2792-8 and ISBN 0-8176-2792-8 (Proceedings Lambrecht 1991)
appeared in: Physical Review A, 50, 1578 - 1580 (1994)
appeared in: Mathematical Quantum Theory II: Schrödinger Operators, J. Feldman, R. Froese, L.M. Rosen eds., CRM Proceedings and Lecture Notes vol. 8, AMS, Providence, 1995, pp. 151 - 162; ISBN 0-8218-0366-2 (Proc. Vancouver Aug. 1993).
appeared in: Differential Equations and Mathematical Physics, Ian Knowles ed., International Press, Boston, 1995, pp. 55-66; ISBN: 1-57146-031-4 (Proceedings Birmingham, AL, March 1994)
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appeared in: Inverse Problems 12, 409 - 418, 1996
erschienen in: Mathematik - Schlüsseltechnologie für die Zukunft, K.-H. Hoffmann, W. Jäger, T. Lohmann, H. Schunck Hrsg., Springer, Berlin etc., 1997, Seite 161 - 174; ISBN 3-540-61677-2 (Proceedings des Statusseminars der anwendungsorientierten Verbundprojekte auf dem Gebiet der Mathematik des BMBF, München, Okt. 1995)
appeared in: Understanding Physics,
A.K. Richter ed., Copernicus Gesellschaft, Katlenburg-Lindau, 1998,
pp. 31 - 48; ISBN 3-9804862-2-2 (Proceedings Bonn 1996)
Abstract, preprint:
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Extended Abstract of our lectures,
appeared in: Mini-proceedings: First MaPhySto Workshop on Inverse Problems:
Inverse Problems in Stratified Media, MaPhySto Miscellanea no. 13, 1999,
ISSN 1398-5957, Dept. Math. Sciences, Univ. of Aarhus, Denmark, pp. 5 - 21.
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appeared in:
Proc. Indian Acad. Sci. (Math. Sci.), 112, pp. 55 - 70
(2002)
Special Issue on Spectral and
Inverse Spectral Theory (Proceedings Goa, India,
Dec. 2000), P.D. Hislop, M. Krishna eds.
appeared in: Mathematical Results in Quantum Mechanics, R. Weder, P. Exner, B. Grébert eds., Contemporary Mathematics vol. 307, Amer. Math. Soc., Providence, 2002, pp. 113 - 127 (Proc. QMath-8, Taxco, Mexico, Dec. 2001)