Geodesic
Gaussian torsion of a 2-dimensional surface defined implicitly in 4-dimensional Euclidean space
Sbornik. Mathematics, Tome 195 (2004) no. 11, pp. 1545-1556

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An expression is found for the Gaussian torsion of a surface $F^2$ in 4-dimensional Euclidean space $E^2$ defined implicitly by a system of two equations. An application of this formula for the intersection of two quadrics is considered as an example. 
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     author = {Yu. A. Aminov and M. G. Szajewska},
     title = {Gaussian torsion of a 2-dimensional surface defined implicitly in 4-dimensional {Euclidean} space},
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     url = {http://geodesic.mathdoc.fr/item/SM_2004_195_11_a0/}
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Yu. A. Aminov; M. G. Szajewska. Gaussian torsion of a 2-dimensional surface defined implicitly in 4-dimensional Euclidean space. Sbornik. Mathematics, Tome 195 (2004) no. 11, pp. 1545-1556. http://geodesic.mathdoc.fr/item/SM_2004_195_11_a0/