Lempertz, one of Europe's foremost art auction houses, is putting up works by painter Gerhard Richter for sale. He’s regarded as one of the most prominent living artists. What prices are expected for the works?<br /><br />For more about art auction http://www.dw.com/en/leonardo-da-vinci-painting-smashes-auction-record-at-450-million/a-41402102
