Please can some advise on this how much can person quote from an academic paper in a book they are writing with out having to pay for the permission to do so? Can I quote a word for section headings while my explanation is entirely my own?

Can I state that some thing is based on someone's work (from a paper) while putting it in my own words with out having to get permission to mention their work?

This is causing problems as I'm being quoted 85 to 850 euros to quote what amounts to about a paragraph.

Any advice would be appreciated.

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