Editors. "Gustavus II of Sweden campaigns at Gullberg". The Literary Encyclopedia. First published 01 February 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15705, accessed 19 April 2015.]
Gustavus II of Sweden, eager to end the War of Kalmar, reopens his military campaign at Gullberg.
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