they are always made in reply to specific questions at court, so there is no Need to translate "απαντητική"
see the following links:

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Note added at 4 hrs (2015-11-10 13:44:21 GMT)
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Sworn declaration - Wikipedia, the free encyclopedia



https://en.wikipedia.org/wiki/Sworn_declaration
A sworn declaration (also called a sworn statement or a statement under penalty of perjury) is a document that recites facts pertinent to a legal proceeding.


Statutory declaration - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Statutory_declaration
It is similar to a statement made under oath, however, it is not sworn. Statutory declarations are commonly used to allow a person to declare something to be true

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Note added at 4 hrs (2015-11-10 13:50:38 GMT)
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sorry for this awkwardly arranged info. but I was prevented from having the text re-arranged

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Note added at 4 hrs (2015-11-10 14:00:13 GMT)
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a written sworn declaration or written declaration on oath is just another denomination for the Affidavit:
An affidavit (/ˌæfɨˈdeɪvɨt/ A-fə-DAY-vət) is a written sworn statement of fact voluntarily ... under an oath or affirmation administered by a person authorized to do so by law. ... In some cases, an introductory clause, called a preamble, is added attesting that the affiant personally appeared before the authenticating authority.