Geodesic
Geometric constructions in the class of Busemann nonpositively curved spaces
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 5 (2009) no. 1, pp. 25-37
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The procedures of gluing and the Hausdorff limit in the class of metric spaces nonpositively curved in the sense of Busemann are studied in the paper. Conditions under which the resulting spaces belong to the same class are found. 
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P. D. Andreev. Geometric constructions in the class of Busemann nonpositively curved spaces. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 5 (2009) no. 1, pp. 25-37. http://geodesic.mathdoc.fr/item/JMAG_2009_5_1_a2/

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