thank you Randy and Richard for your appreciation, good questions
and productive criticisms.
i'll do my best to answer you but first i wish to involve some more
participants and get other feedbacks to my list of basic factors.
some points of it are doubtful also to me, but i am sure the factors list
deserves further discussion
if one agrees with my last thesis, he (she) is welcome to send comments
thank you in advance, best
Nikolai