Frésard, Raymond; Hackenberger, Christian; Kopp, Thilo Magnetic transitions in strong coupling expansions for nearly degenerate states. (English) Zbl 1253.81165 Ann. Phys., Berlin 524, No. 8, 411-420 (2012). MSC: 81V70 81Q15 82D40 PDFBibTeX XMLCite \textit{R. Frésard} et al., Ann. Phys., Berlin 524, No. 8, 411--420 (2012; Zbl 1253.81165) Full Text: DOI arXiv
Frésard, Raymond; Kopp, Thilo Exact results with the Kotliar-Ruckenstein slave-boson representation. (English) Zbl 1243.82039 Ann. Phys., Berlin 524, No. 3-4, 175-181 (2012). MSC: 82B44 82B30 82C22 PDFBibTeX XMLCite \textit{R. Frésard} and \textit{T. Kopp}, Ann. Phys., Berlin 524, No. 3--4, 175--181 (2012; Zbl 1243.82039) Full Text: DOI arXiv