The DFT module uses Lebedev-Laikov grids, using the code distributed through CCL (http://www.ccl.net/).

.. code-block:: text

       This subroutine is part of a set of subroutines that generate
       Lebedev grids [1-6] for integration on a sphere. The original 
       C-code [1] was kindly provided by Dr. Dmitri N. Laikov and 
       translated into fortran by Dr. Christoph van Wuellen.
       This subroutine was translated using a C to fortran77 conversion
       tool written by Dr. Christoph van Wuellen.
    
       Users of this code are asked to include reference [1] in their
       publications, and in the user- and programmers-manuals 
       describing their codes.
    
       This code was distributed through CCL (http://www.ccl.net/).
    
       [1] V.I. Lebedev, and D.N. Laikov
           "A quadrature formula for the sphere of the 131st
            algebraic order of accuracy"
           Doklady Mathematics, Vol. 59, No. 3, 1999, pp. 477-481.
    
       [2] V.I. Lebedev
           "A quadrature formula for the sphere of 59th algebraic
            order of accuracy"
           Russian Acad. Sci. Dokl. Math., Vol. 50, 1995, pp. 283-286. 
    
       [3] V.I. Lebedev, and A.L. Skorokhodov
           "Quadrature formulas of orders 41, 47, and 53 for the sphere"
           Russian Acad. Sci. Dokl. Math., Vol. 45, 1992, pp. 587-592. 
    
       [4] V.I. Lebedev
           "Spherical quadrature formulas exact to orders 25-29"
           Siberian Mathematical Journal, Vol. 18, 1977, pp. 99-107. 
    
       [5] V.I. Lebedev
           "Quadratures on a sphere"
           Computational Mathematics and Mathematical Physics, Vol. 16,
           1976, pp. 10-24. 
    
       [6] V.I. Lebedev
           "Values of the nodes and weights of ninth to seventeenth 
            order Gauss-Markov quadrature formulae invariant under the
            octahedron group with inversion"
           Computational Mathematics and Mathematical Physics, Vol. 15,
           1975, pp. 44-51.