@article{10_4153_CJM_1997_057_x,
     author = {Ku, Hsu-Tung and Ku, Mei-Chin and Zhang, Xin-Min},
     title = {Isoperimetric {Inequalities} on {Surfaces} of {Constant} {Curvature}},
     journal = {Canadian journal of mathematics},
     pages = {1162--1187},
     year = {1997},
     volume = {49},
     number = {6},
     doi = {10.4153/CJM-1997-057-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1997-057-x/}
}