Engel, Klaus-J. Spectral theory and generator property for one-sided coupled operator matrices. (English) Zbl 0924.47024 Semigroup Forum 58, No. 2, 267-295 (1999). MSC: 47D06 PDFBibTeX XMLCite \textit{K.-J. Engel}, Semigroup Forum 58, No. 2, 267--295 (1999; Zbl 0924.47024) Full Text: DOI
Engel, Klaus-J. Positivity and stability for one-sided coupled operator matrices. (English) Zbl 0907.47038 Positivity 1, No. 2, 103-124 (1997). MSC: 47D06 PDFBibTeX XMLCite \textit{K.-J. Engel}, Positivity 1, No. 2, 103--124 (1997; Zbl 0907.47038) Full Text: DOI
Engel, Klaus Jochen Systems of evolution equations. (English) Zbl 0880.34061 Conf. Semin. Mat. Univ. Bari 258-260, No. 260, 61-109 (1994). Reviewer: W.Lamb (Glasgow) MSC: 34G10 47D06 34L05 47E05 47A66 PDFBibTeX XMLCite \textit{K. J. Engel}, Conf. Semin. Mat. Univ. Bari 258--260, No. 260, 61--109 (1994; Zbl 0880.34061)
Engel, Klaus-J. On dissipative wave equations in Hilbert space. (English) Zbl 0833.34053 J. Math. Anal. Appl. 184, No. 2, 302-316 (1994). Reviewer: J.Voigt (Dresden) MSC: 34G10 47D06 47D09 47B44 PDFBibTeX XMLCite \textit{K.-J. Engel}, J. Math. Anal. Appl. 184, No. 2, 302--316 (1994; Zbl 0833.34053) Full Text: DOI
Engel, Klaus-Jochen On the diagonalization of certain operator matrices related to Volterra equations. (English) Zbl 0794.34050 Dore, Giovanni (ed.) et al., Differential equations in Banach spaces. Proceedings of the 2nd conference on differential equations in Banach spaces held at Bologna, Italy, 1991. New York: Marcel Dekker, Inc.. Lect. Notes Pure Appl. Math. 148, 59-64 (1993). Reviewer: V.G.Angelov (Sofia) MSC: 34G10 45J05 PDFBibTeX XMLCite \textit{K.-J. Engel}, Lect. Notes Pure Appl. Math. 148, 59--64 (1993; Zbl 0794.34050)
Engel, Klaus-J. On singular perturbations of second order Cauchy problems. (English) Zbl 0743.34063 Pac. J. Math. 152, No. 1, 79-91 (1992). Reviewer: R.Nagel (Tübingen) MSC: 34G10 34C11 34D15 PDFBibTeX XMLCite \textit{K.-J. Engel}, Pac. J. Math. 152, No. 1, 79--91 (1992; Zbl 0743.34063) Full Text: DOI
Engel, Klaus-J. An application of polynomial operator matrices to a second order Cauchy problem. (English) Zbl 0767.47017 Differential equations with applications in biology, physics, and engineering, Proc. Int. Conf., Leibnitz/Austria, Lect. Notes Pure Appl. Math. 133, 115-120 (1991). Reviewer: S.L.Edelstein (Rostov-na-Donu) MSC: 47D06 47D09 35G10 35R20 PDFBibTeX XMLCite \textit{K.-J. Engel}, Lect. Notes Pure Appl. Math. 133, 115--120 (1991; Zbl 0767.47017)