  The paper presents a method for calculation of non-spherical particle
T-matrices based on the volume integral equation and the spherical vector wave
function basis, and relies on the Generalized Source Method rationale. The
developed method appears to be close to the invariant imbedding approach, and
the derivations aims at intuitive demonstration of the calculation scheme. In
parallel calculation of single columns of T-matrix is considered in detail, and
it is shown that this way not only has a promising potential of parallelization
but also yields an almost zero power balance for purely dielectric particles.
