@article{10_4153_CMB_2003_032_x,
     author = {Wang, Xiaofeng},
     title = {Second {Order} {Dehn} {Functions} of {Asynchronously} {Automatic} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {310--318},
     year = {2003},
     volume = {46},
     number = {2},
     doi = {10.4153/CMB-2003-032-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-032-x/}
}