| Summary: | In the bibliography of this thesis, the authors are listed in alphabetical order. In the text, the references are given by the name of the author or authors and the year of publication. When the same author or authors published two or more papers in the same year, to avoid confusion, the papers are indicated in their order of publication by adding to the year small letters of the alphabet. Thus Moore, Sandberg and Watne published two papers in 1960. The first is listed as Moore, Sandberg and Watne (1960 a), and the second as Moore, Sandberg and Watne (1960 b).
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