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  • Title page

    On the "Fundamental Principle" of L. Ehrenpreis

    Hansen, Sönke
    In: Partial differential equations : papers presented at Stefan Banach International Math. Center at the semester "Partial differential equations" held Sept. 11 - Dec. 16, 1978 (Banach Center publications : 10), Vol. 1983, page 185-201
  • Title page

    Propagation of discontinuities in wave fields

    Hansen, Sönke
    In: Proceedings on "Model Optimization in Exploration Geophysics" (6th International Seminar, Berlin, February 1988), Vol. 1989, page 31-39