@misc{_[Polignac,
 howpublished={online},
 language={lat},
 title={[Polignac Melchior de]},
 keywords={portrait, man, cardinal, statesman, French graphics, engraving, Polignac Melchior de (1661-1742), 17-18 w., 17.-18. Jh., 17-18 century},
}