https://guernica.museoreinasofia.es/en/document/cleaning-guernica-two-restorers-after-tony-shafrazis-graffiti
The cleaning of Guernica by two restorers after Tony Shafrazi's graffiti | Repensar Guernica
Research into Pablo Picasso's Guernica, conducted by the Museo Reina Sofía and made up of around 2,000 documents
tony shafrazicleaningguernicatworestorers