Abstract:This thesis is submitted in accordance with the regulations for the Doctor of Philosophy degree at the University of Szeged. The results presented in the thesis are the author's original work, with the exceptions of Chapter [1], sections (2.1) and (4.2), and subsection (3.5.1), which reviews pre-existing material or overviews the physical meaning of the quantities investigated in the given chapter. Relevant citations were given at appropriate points.
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