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The steps you need to take are explained on the website of the Graduate School of the UZH Faculty of Arts and Social Sciences:
The regulations for the current (PVO 2019) and earlier PhD programs (PVO 2006 and PVO 2009) are available on the website of the UZH Faculty of Arts and Social Sciences.
Note: While UZH websites and other information has been translated into English, the legally binding regulations are available in German only.