Provides integration quadrature for the unit tetrahedron in 3D for exact integration of polynomials up to degree 14.
By a linear transformation, the quadrature was obtained from the paper:
Lin-bo Zhang, Tao Cui and Hui Liu,
A set of symmetric quadrature rules on triangles and tetrahedra,
J. Comp. Math., 26(3), 2008.
Added some documentation.
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