@article{10_2140_agt_2002_2_381,
     author = {Okun, Boris},
     title = {Exotic smooth structures on nonpositively curved symmetric spaces},
     journal = {Algebraic and Geometric Topology},
     pages = {381--389},
     year = {2002},
     volume = {2},
     number = {1},
     doi = {10.2140/agt.2002.2.381},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.381/}
}