@article{JMAG_2009_5_1_a2,
     author = {P. D. Andreev},
     title = {Geometric constructions in the class of {Busemann} nonpositively curved spaces},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {25--37},
     year = {2009},
     volume = {5},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2009_5_1_a2/}
}