Nolan, Clifford J.; Uhlmann, Gunther Parametrices for symmetric systems with multiplicity. (English) Zbl 1231.35007 Wave Motion 44, No. 4, 231-247 (2007). MSC: 35A17 35A27 35Q60 35Q74 35R30 74J05 78A25 PDFBibTeX XMLCite \textit{C. J. Nolan} and \textit{G. Uhlmann}, Wave Motion 44, No. 4, 231--247 (2007; Zbl 1231.35007) Full Text: DOI
Dencker, Nils The propagation of polarization in double refraction. (English) Zbl 0767.58041 J. Funct. Anal. 104, No. 2, 414-468 (1992). Reviewer: J.Monterde (Burjasot) MSC: 58J47 58J40 35S05 78A05 PDFBibTeX XMLCite \textit{N. Dencker}, J. Funct. Anal. 104, No. 2, 414--468 (1992; Zbl 0767.58041) Full Text: DOI