Berg, I. D.; Nikolaev, I. G. On a distance between directions in an Aleksandrov space of curvature \(\leq K\). (English) Zbl 0977.53033 Mich. Math. J. 45, No. 2, 257-289 (1998). MSC: 53C20 PDFBibTeX XMLCite \textit{I. D. Berg} and \textit{I. G. Nikolaev}, Mich. Math. J. 45, No. 2, 257--289 (1998; Zbl 0977.53033) Full Text: DOI
Nikolaev, Igor The tangent cone of an Aleksandrov space of curvature \(\leq K\). (English) Zbl 0822.53043 Manuscr. Math. 86, No. 2, 137-147 (1995). Reviewer: S.B.Alexander (Urbana) MSC: 53C70 51K10 53C21 PDFBibTeX XMLCite \textit{I. Nikolaev}, Manuscr. Math. 86, No. 2, 137--147 (1995; Zbl 0822.53043) Full Text: DOI EuDML
Berestovskij, V. N.; Nikolaev, I. G. Multidimensional generalized Riemannian spaces. (English. Russian original) Zbl 0781.53049 Geometry. IV. Non-regular Riemannian geometry. Encycl. Math. Sci. 70, 168-243 (1993); translation from Itogi Nauki Tekh., Ser. Sovrem. Probl. Mat., Fundam. Napravleniya 70, 190-272 (1992). MSC: 53C45 53C70 53-02 PDFBibTeX XML
Nikolaev, I. G. Bounded curvature closure of the set of compact Riemannian manifolds. (English) Zbl 0726.53042 Bull. Am. Math. Soc., New Ser. 24, No. 1, 171-177 (1991). Reviewer: Adolf Riede (Heidelberg) MSC: 53C45 51K10 53C23 PDFBibTeX XMLCite \textit{I. G. Nikolaev}, Bull. Am. Math. Soc., New Ser. 24, No. 1, 171--177 (1991; Zbl 0726.53042) Full Text: DOI
Nikolaev, I. G. On the axioms of Riemannian geometry. (English. Russian original) Zbl 0701.53064 Sov. Math., Dokl. 40, No. 1, 172-174 (1990); translation from Dokl. Akad. Nauk SSSR 307, No. 4, 812-814 (1989). Reviewer: W.Kaiser MSC: 53C20 53C99 PDFBibTeX XMLCite \textit{I. G. Nikolaev}, Sov. Math., Dokl. 40, No. 1, 172--174 (1990; Zbl 0701.53064); translation from Dokl. Akad. Nauk SSSR 307, No. 4, 812--814 (1989)
Berestovskiĭ, V. N.; Nikolaev, I. G. Many-dimensional generalized Riemannian spaces. (Russian) Zbl 0737.53058 Itogi Nauki Tekh., Ser. Sovrem. Probl. Mat., Fundam. Napravleniya 70, 190-272 (1989). Reviewer: Walery Kaiser (Zaporozhye) MSC: 53C45 53C70 53-02 PDFBibTeX XMLCite \textit{V. N. Berestovskiĭ} and \textit{I. G. Nikolaev}, Itogi Nauki Tekh., Ser. Sovrem. Probl. Mat., Fundam. Napravleniya 70, 190--272 (1989; Zbl 0737.53058)
Aleksandrov, A. D.; Berestovskij, V. N.; Nikolaev, I. G. Generalized Riemannian spaces. (English. Russian original) Zbl 0625.53059 Russ. Math. Surv. 41, No. 3, 1-54 (1986); translation from Usp. Mat. Nauk 41, No. 3(249), 3-44 (1986). Reviewer: J.Bureš MSC: 53C99 53-02 PDFBibTeX XMLCite \textit{A. D. Aleksandrov} et al., Russ. Math. Surv. 41, No. 3, 1--54 (1986; Zbl 0625.53059); translation from Usp. Mat. Nauk 41, No. 3(249), 3--44 (1986) Full Text: DOI
Nikolaev, I. G. Smoothness of the metric of spaces with two-sided bounded Aleksandrov curvature. (English. Russian original) Zbl 0547.53011 Sib. Math. J. 24, 247-263 (1983); translation from Sib. Mat. Zh. 24, No. 2(138), 114-132 (1983). Reviewer: M.Craioveanu MSC: 53B20 PDFBibTeX XMLCite \textit{I. G. Nikolaev}, Sib. Math. J. 24, 247--263 (1983; Zbl 0547.53011); translation from Sib. Mat. Zh. 24, No. 2(138), 114--132 (1983) Full Text: DOI Backlinks: MO
Nikolaev, I. G. On the parallel displacement of vectors in spaces with two-sided bounded curvature in the sense of A. D. Aleksandrov. (English. Russian original) Zbl 0539.53030 Sib. Math. J. 24, 106-119 (1983); translation from Sib. Mat. Zh. 24, No. 1(137), 130-145 (1983). Reviewer: M.Craioveanu MSC: 53C20 PDFBibTeX XMLCite \textit{I. G. Nikolaev}, Sib. Math. J. 24, 106--119 (1983; Zbl 0539.53030); translation from Sib. Mat. Zh. 24, No. 1(137), 130--145 (1983) Full Text: DOI EuDML
Nikolaev, I. G. Parallel translation and smoothness of the metric of spaces of bounded curvature. (English. Russian original) Zbl 0505.53015 Sov. Math., Dokl. 21, 263-265 (1980); translation from Dokl. Akad. Nauk SSSR 250, 1056-1058 (1980). MSC: 53C20 PDFBibTeX XMLCite \textit{I. G. Nikolaev}, Sov. Math., Dokl. 21, 263--265 (1980; Zbl 0505.53015); translation from Dokl. Akad. Nauk SSSR 250, 1056--1058 (1980)