Kasim, A. , Mohammad, N. , Aurangzaib, A. , Sharidan, S. (2012), 'Natural Convection Boundary Layer Flow of a Viscoelastic Fluid on Solid Sphere with Newtonian Heating', World Academy of Science, Engineering and Technology, Open Science Index 64, International Journal of Physical and Mathematical Sciences, 6(4), 410 - 415.