Berg, I. D.; Nikolaev, Igor G. Characterization of Aleksandrov spaces of curvature bounded above by means of the metric Cauchy-Schwarz inequality. (English) Zbl 1402.53027 Mich. Math. J. 67, No. 2, 289-332 (2018). Reviewer: Charalampos Charitos (Athinai) MSC: 53C20 53C45 51K10 PDFBibTeX XMLCite \textit{I. D. Berg} and \textit{I. G. Nikolaev}, Mich. Math. J. 67, No. 2, 289--332 (2018; Zbl 1402.53027) Full Text: DOI Euclid
Berg, I. D.; Nikolaev, Igor G. \(K\)-Euler’s inequality in Aleksandrov’s \(\mathrm{CAT}(K)\) space. (English) Zbl 1390.53021 J. Geom. 108, No. 3, 869-878 (2017). Reviewer: Abdoul Salam Diallo (Bambey) MSC: 53C20 53C45 51K10 PDFBibTeX XMLCite \textit{I. D. Berg} and \textit{I. G. Nikolaev}, J. Geom. 108, No. 3, 869--878 (2017; Zbl 1390.53021) Full Text: DOI
Berg, I. D.; Nikolaev, I. G. Quasilinearization and curvature of Aleksandrov spaces. (English) Zbl 1144.53045 Geom. Dedicata 133, 195-218 (2008). Reviewer: Themistocles M. Rassias (Athens) MSC: 53C20 53C45 51K10 PDFBibTeX XMLCite \textit{I. D. Berg} and \textit{I. G. Nikolaev}, Geom. Dedicata 133, 195--218 (2008; Zbl 1144.53045) Full Text: DOI