When there are more than two authors, only the name of the first one is used, followed by et al . 6. Numbers of references are given in the order in which they first appear in the text. If each issue of a journal has its own pagination the issue number should be indicated in brackets after the volume number. All other abbreviations have to be explained in the manuscript at first usage, if aforementioned directions are not applicable. Footnotes must be numbered consecutively and are to be added separately to the manuscript.
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