theInternationalConferenceonPseudo-Di?erential Operators and Related Topics was held at V] axjo ] University in Sweden from June 22 to June 25, 2004. The conferencewas supported by Vaxj ] oU ] niversity, theFIRB Research Group on Microlocal Analysis of Universit a di Torino, and the Int- national Society for Analysis, its Applications and Computation (ISAAC). The conferencewas well attended by about 50 mathematicians fromBulgaria, Canada, Denmark, England, Finland, Germany, Italy, Japan, Mexico, Serbiaand Monte- gro, Russia and Sweden. The conference covered a broad spectrum of topics related to pseudo-di?erential operators such as partial di?erential equations, quantization, Wigner transforms andWeyltransformsonLiegroups, mathematicalphysics, time-frequencyanalysis and stochastic processes. The speakers were enthusiastic about the prospect of publishing articles based on their presentations in a volume to be published in Professor Israel Gohberg s prestigious series entitled Operator Theory: Advances and Applications . All contributions from speakers have been carefully refereed and the articles c- lected in this volume give a representative ?avour of the mathematics presented at the conference. This volume is a permanent record of the conference and a valuable complement to the volume Advances in Pseudo-Di?erential Operators published in the same series in 2004, which is devoted to the Special Session on Pseudo-Di?erential Operators at the Fourth ISAAC Congress held at York U- versity in August 2003. Operator Theory: Advances and Applications, Vol. 164, 1 21 c 2006 Birkh] auser Verlag Basel/Switzerland Strongly Elliptic Second Order Systems with Spectral Parameter in Transmission Conditions on a Nonclosed Surface M. S."

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