T. V. S. Sekhar, B. Hema Sundar Raju and Y. V. S. S. Sanyasiraju. (2012). Higher-Order Compact Scheme for the Incompressible Navier-Stokes Equations in Spherical Geometry.
Communications in Computational Physics. 11 (1).
99-113.
doi:10.4208/cicp.171010.030311a