Kutyniok, Gitta; Paternostro, Victoria; Philipp, Friedrich The effect of perturbations of operator-valued frame sequences and fusion frames on their duals. (English) Zbl 1383.42031 Oper. Matrices 11, No. 2, 301-336 (2017). Reviewer: Ghanshyam Bhatt (Nashville) MSC: 42C15 46C05 PDFBibTeX XMLCite \textit{G. Kutyniok} et al., Oper. Matrices 11, No. 2, 301--336 (2017; Zbl 1383.42031) Full Text: DOI arXiv
Philipp, Friedrich; Trunk, Carsten Spectral points of type \(\pi_{+}\) and type \(\pi_{-}\) of closed operators in indefinite inner product spaces. (English) Zbl 1448.47012 Oper. Matrices 9, No. 3, 481-506 (2015). Reviewer: Vladimir A. Derkach (Donetsk) MSC: 47A10 47B50 46C20 47A55 PDFBibTeX XMLCite \textit{F. Philipp} and \textit{C. Trunk}, Oper. Matrices 9, No. 3, 481--506 (2015; Zbl 1448.47012) Full Text: DOI arXiv Link
Philipp, Friedrich Indefinite Sturm-Liouville operators with periodic coefficients. (English) Zbl 1291.34051 Oper. Matrices 7, No. 4, 777-811 (2013). Reviewer: Andreas Fleige (Dortmund) MSC: 34B24 34B09 34L10 47B50 47E05 PDFBibTeX XMLCite \textit{F. Philipp}, Oper. Matrices 7, No. 4, 777--811 (2013; Zbl 1291.34051) Full Text: DOI arXiv Link