TY  - JOUR
AU  - P. D. Andreev
TI  - Geometric constructions in the class of Busemann nonpositively curved spaces
JO  - Žurnal matematičeskoj fiziki, analiza, geometrii
PY  - 2009
SP  - 25
EP  - 37
VL  - 5
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/JMAG_2009_5_1_a2/
LA  - en
ID  - JMAG_2009_5_1_a2
ER  -