A novel cubic-order algorithm for approximating principal direction vectors. Goldfeather, J. & Interrante, V. ACM Transactions on Graphics, 23(1):45-63, 2004.
bibtex   
@Article{Goldfeather_2004_9876,
  author = {Goldfeather, J. and Interrante, V.},
 journal = {ACM Transactions on Graphics},
 number = {1},
 pages = {45-63},
 title = {A novel cubic-order algorithm for approximating principal direction vectors},
 volume = {23},
 year = {2004},
 title_with_no_special_chars = {A Novel CubicOrder Algorithm for Approximating Principal Direction Vectors}
}
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