@article{IM_1992__108_2_143987,
     author = {Bruce Kleiner},
     title = {An isoperimetric comparison theorem.},
     journal = {Inventiones mathematicae},
     pages = {37--48},
     publisher = {mathdoc},
     volume = {108},
     number = {2},
     year = {1992},
     zbl = {0770.53031},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_143987/}
}