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In page La Bella Principessa:

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The drawing was shown as a Leonardo in a 2010 exhibition called And there was Light in Eriksberg, Gothenburg, in Sweden,[8] and was estimated by various newspaper reports to be worth more than $160 million.[9][10][11][12][13][14] Silverman promoted the Leonardo connection in his 2012 book Leonardo's Lost Princess: One Man's Quest to Authenticate an Unknown Portrait by Leonardo da Vinci and has declined an offer for the portrait of $80 million.[citation needed]