“…Sahni et al (1992) consider the case of backward-forward-linearly anisotropic scattering, but as observed by the authors themselves the inclusion of anisotropic kernels of higher order in their methodology yield great complications, thereby limiting their methodology. Even more recent works (see, for instance, Öztürk, 2014;Yilmazer, 2007;Bülbül et al, 2011) have not presented solutions for the general case where the kernel has very strong anisotropies.…”