@article{DOCMA_2012__17__a21,
     author = {Hu, Jun and Xiao, Zhankui},
     title = {On a theorem of {Lehrer} and {Zhang.}},
     journal = {Documenta mathematica},
     pages = {245--270},
     publisher = {mathdoc},
     volume = {17},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2012__17__a21/}
}