151. ** ^  ** The French Ministry of Foreign affairs.  "The Louvre, the most visited museum in the world (01.15)"  . _France Diplomatie :: Ministry of Foreign Affairs and International Development_ .  Archived  from the original on 22 December 2015.
152. ** ^  **  "On a Mission to Loosen Up the Louvre"  . _The New York Times_ . 11 October 2009.  Archived  from the original on 24 December 2016.
153. ** ^  ** Young, Mark, ed. (1999).  _The Guinness Book of World Records 1999_  . Bantam Books. p. 381.  ISBN  "ISBN \(identifier\)")  978-0-553-58075-4   .
154. ** ^  **  "Culture – Could France sell the Mona Lisa to pay off its debts?"  . _France 24_ . 2 September 2014.  Archived  from the original on 30 November 2015.
155. ** ^  **  "La Gioconda, Leonardo's atelier"  . _Museo Nacional del Prado_ .  Archived  from the original on 8 December 2015  . Retrieved  7 December  2015  .
156. ** ^  **  "The 'Prado Mona Lisa' – The Mona Lisa Foundation"  . _The Mona Lisa Foundation_ . 11 September 2012. Archived from  the original  on 17 December 2015  . Retrieved  11 December  2015  .
157. ** ^  ** Carbon, C. C.; Hesslinger, V. M. (August 2013).  "Da Vinci's Mona Lisa Entering the Next Dimension"  . _Perception_ . **42** (8): 887–893.  doi  "Doi \(identifier\)") :   10.1068/p7524  .  PMID  "PMID \(identifier\)")  24303752  .
158. ** ^  **  Tweened animated gif of Mona Lisa and Prado version   Archived  7 February 2017 at the  Wayback Machine  by Carbon and Hesslinger
159. ** ^  ** Brooks, K. R. (1 January 2017).  "Depth Perception and the History of Three-Dimensional Art: Who Produced the First Stereoscopic Images?"  . _i-Perception_ . **8** (1): 204166951668011.  doi  "Doi \(identifier\)") :  10.1177/2041669516680114  .  PMC  "PMC \(identifier\)")  5298491  .  PMID  "PMID \(identifier\)")  28203349  .
160. ** ^  ** Dutta, Kunal (15 December 2014).  "  'Early Mona Lisa': Unveiling the one-in-a-million identical twin to Leonardo da Vinci painting"  . _ Independent.co.uk  _ .  Archived  from the original on 16 December 2014.
161. ** ^  ** Rosenbaum, Matthew (27 September 2012).  "Second Mona Lisa Unveiled for First Time in 40 Years"  . _ ABC News  _ . ABC News Internet Ventures  . Retrieved  12 June  2020  .
162. ** ^  ** Alastair Sooke.  "The Isleworth Mona Lisa: A second Leonardo masterpiece?"  . BBC.  Archived  from the original on 2 January 2016.
163. ** ^  **  "New proof said found for "original" Mona Lisa –"  . Reuters.com. 13 February 2013  . Retrieved  26 July  2017  .
164. ** ^  ** Lorusso, Salvatore; Natali, Andrea (January 2015).  "Mona Lisa: A Comparative Evaluation of the Different Versions and Their Copies"  . _ Conservation Science in Cultural Heritage  _ . **15** : 80.  doi  "Doi \(identifier\)") :  10.6092/issn.1973-9494/6168  .
165. ** ^  ** Asmus, John F. (1 July 1989).  "Computer Studies of the Isleworth and Louvre Mona Lisas"  . _Optical Engineering_ . **28** (7): 800–804.  Bibcode  "Bibcode \(identifier\)") :  1989OptEn..28..800A  .  doi  "Doi \(identifier\)") :  10.1117/12.7977036  . Retrieved  26 July  2017  .
166. ** ^  ** Kemp 2018  : "  Alessandro Vezzosi  , who spoke at the launch in  Geneva  , and  Carlo Pedretti  , the great Leonardo specialist, made encouraging but noncommittal statements about the picture being of high quality and worthy of further research."
167. ** ^  **  Portrait of Gioconda (copy)  , hermitagemuseum.org.
168. ** ^  ** Mastromattei, Dario (16 February 2016).  "La Gioconda (o Monna Lisa) di Leonardo da Vinci: analisi"  .
169. ** ^  ** Horstmann G, Loth S (2019).  "The Mona Lisa Illusion-Scientists See Her Looking at Them Though She Isn't"  . _Iperception_ . **10** (1).  doi  "Doi \(identifier\)") :  10.1177/2041669518821702  .  PMC  "PMC \(identifier\)")  6327345  .  PMID  "PMID \(identifier\)")  30671222  .