Geodesic
Geometry of Ideal Boundaries of Geodesic Spaces with Nonpositive Curvature in the Sense of Busemann
Matematičeskie trudy, Tome 10 (2007) no. 1, pp. 16-28

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We establish relations between different approaches to the ideal closure of a geodesic metric space with nonpositive curvature in the sense of Busemann. We construct the counterexample showing that the Busemann ideal closure can differ from the geodesic closure. 
@article{MT_2007_10_1_a1,
     author = {P. D. Andreev},
     title = {Geometry of {Ideal} {Boundaries} of {Geodesic} {Spaces} with {Nonpositive} {Curvature} in the {Sense} of {Busemann}},
     journal = {Matemati\v{c}eskie trudy},
     pages = {16--28},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2007_10_1_a1/}
}
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P. D. Andreev. Geometry of Ideal Boundaries of Geodesic Spaces with Nonpositive Curvature in the Sense of Busemann. Matematičeskie trudy, Tome 10 (2007) no. 1, pp. 16-28. http://geodesic.mathdoc.fr/item/MT_2007_10_1_a1/