@article{Hildebrandt2011a, author = {Klaus Hildebrandt and Konrad Polthier}, title = {On approximation of the {L}aplace--{B}eltrami operator and the {W}illmore energy of surfaces}, journal = {Computer Graphics Forum}, year = {2011}, volume = {30}, pages = {1513--1520}, number = {5}, doi = {10.1111/j.1467-8659.2011.02025.x}, issn = {1467-8659}, publisher = {Blackwell Publishing Ltd}, url = {http://dx.doi.org/10.1111/j.1467-8659.2011.02025.x} }