@article{JGAA_2012_16_4_a2,
     author = {Immanuel Halupczok and Andr\'e Schulz},
     title = {Pinning balloons with perfect angles and optimal area},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {847--870},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {2012},
     doi = {10.7155/jgaa.00280},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00280/}
}