 In the 1930s, Iranian scholars, notably Mohammad-Ali Foroughi, attempted to reconstruct a core of authentic verses from scattered quotes by authors of the 13th and 14th centuries, ignoring the younger manuscript tradition.After World War II, reconstruction efforts were significantly delayed by two clever forgeries.De Blois (2004) is pessimistic, suggesting that contemporary scholarship has not advanced beyond the situation of the 1930s, when Hans Heinrich Schaeder commented that the name of Omar Khayyam "is to be struck out from the history of Persian literature".