Milan, May 6 - European stocks closed generally flat on Monday. In Milan, the FTSE-Mib index shed 0.35% to close at 16,862 points and the FTSE All-Share lost 0.26% to close at 17.919 points. In Madrid, the Ibex 35 index lost 0.48% to close at 8,503.80 points while in Frankfurt, the DAX fell by 0.13% to close at 8,112.08 points. The Paris CAC-40 index closed down 0.15% at 3,907.04 points. The London bourse was closed for a holiday. The spread between Italian 10-year bonds and the German benchmark bund, a key indicator in investor confidence in Italy's ability to weather the euro crisis, was 267 basis points with a yield of 3.91%.