Editors. "'Perpetual' Alliance between Prussia and Sweden". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17072, accessed 25 September 2016.]
A 'Perpetual' Alliance is signed between Prussia and Sweden. According to the terms of this agreement, each promises to supply the other with military support in event of attack by a third party.
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