1. V. E. Nazaikinskii, “Phase Space Geometry for a Wave Equation Degenerating on the Boundary of the Domain”, Math. Notes, 92:1 (2012), 144–148  mathnet  crossref  crossref  mathscinet  zmath  isi  elib  elib
  2. V. E. Nazaikinskii, “Degenerate Wave Equation with Localized Initial Data: Asymptotic Solutions Corresponding to Various Self-Adjoint Extensions”, Math. Notes, 89:5 (2011), 749–753  mathnet  crossref  crossref  mathscinet  isi
  3. Dobrokhotov S.Yu., Nazaikinskii V.E., Tirozzi B., “Asymptotic solution of the one-dimensional wave equation with localized initial data and with degenerating velocity. I”, Russian J. Math. Phys., 17:4 (2010), 434–447  crossref  mathscinet  zmath  adsnasa  isi  elib  scopus
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