Stefan Dobrev Evangelos Kranakis Danny Krizanc Oscar Morales Ponce Ladislav Stacho Approximating the Edge Length of 2-Edge Connected Planar Geometric Graphs on a Set of Points http://arxiv.org/abs/1112.3523 2011 CoRR abs/1112.3523 db/journals/corr/corr1112.html#abs-1112-3523