A Bulgarian art expert looks at a painting at the National Gallery for Foreign Art in Sofia, October 20, 2004. Art experts say that it is still not clear who is the author of the painting, still, they point out that it has been made by an European artist at the end of 16th century BC. [The precious piece of art, found last week during a special police operation in the city of Stara Zagora, is believed to has been stolen from a private collection in Cyprus in May 2003 and Interpol had launched a search for it.]