@misc{Bittner_Ludwig_(1877-1945)_Die,
 author={Bittner, Ludwig (1877-1945)},
 howpublished={online},
 publisher={Deutsche Verlags-Anstalt},
 language={Polish},
 type={book},
 title={Die Lehre von den völkerrechtlichen Vertragsukunden},
 keywords={theory of law, international agreement, peace treaty},
}