@article{10_21136_MB_2005_134135,
     author = {Shomberg, Joseph},
     title = {A note on surfaces with radially symmetric nonpositive {Gaussian} curvature},
     journal = {Mathematica Bohemica},
     pages = {167--176},
     publisher = {mathdoc},
     volume = {130},
     number = {2},
     year = {2005},
     doi = {10.21136/MB.2005.134135},
     mrnumber = {2148650},
     zbl = {1108.53004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2005.134135/}
}