Note: due to typesetter mistake, the meaning of one sentence in the first paragraph of section 5 changed dramatically, hindering the intended message. Original sentence reads (the words printed in bold font were excluded totally by the publisher):
By that time both research directions had some history, which we will touch below very briefly, giving only a few general highlights and representative examples rather than aiming for a thorough analysis, practically impossible within the whole width of the related topics.
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