On the Choice of Local Element Frame for Co-rotational Triangular Shell Elements. Battini, J. & Pacoste, C. Communications in Numerical Methods in Engineering, 20:819-825, 2004.
bibtex   
@Article{BattPacoste,
    author      = {J.M. Battini and C. Pacoste},
    title       = {On the Choice of Local Element Frame for Co-rotational Triangular Shell Elements},
    journal     = {Communications in Numerical Methods in Engineering},
    pages       = {819-825},
    volume      = {20},
    year        = {2004}
}

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