@article{GFA_1996__6_1_58228,
     author = {S.M. Gersten},
     title = {Preservation and {Distortion} of {Area} in {Finitely} {Presented} {Groups.}},
     journal = {Geometric and functional analysis},
     pages = {301--345},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1996},
     zbl = {0868.20033},
     url = {http://geodesic.mathdoc.fr/item/GFA_1996__6_1_58228/}
}